| Base | Representation |
|---|---|
| bin | 11001001000001… |
| … | …010110000111000 |
| 3 | 1002101021001120110 |
| 4 | 121020022300320 |
| 5 | 1330410243030 |
| 6 | 105455424320 |
| 7 | 13306204560 |
| oct | 3110126070 |
| 9 | 1071231513 |
| 10 | 421571640 |
| 11 | 1a6a6a016 |
| 12 | b92250a0 |
| 13 | 69455199 |
| 14 | 3ddbbda0 |
| 15 | 270251b0 |
| hex | 1920ac38 |
421571640 has 128 divisors (see below), whose sum is σ = 1461888000. Its totient is φ = 95259648.
The previous prime is 421571629. The next prime is 421571651. The reversal of 421571640 is 46175124.
It is an interprime number because it is at equal distance from previous prime (421571629) and next prime (421571651).
It is a Harshad number since it is a multiple of its sum of digits (30).
It is a junction number, because it is equal to n+sod(n) for n = 421571598 and 421571607.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71941 + ... + 77579.
It is an arithmetic number, because the mean of its divisors is an integer number (11421000).
Almost surely, 2421571640 is an apocalyptic number.
421571640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 421571640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (730944000).
421571640 is an abundant number, since it is smaller than the sum of its proper divisors (1040316360).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
421571640 is a wasteful number, since it uses less digits than its factorization.
421571640 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 5749 (or 5745 counting only the distinct ones).
The product of its (nonzero) digits is 6720, while the sum is 30.
The square root of 421571640 is about 20532.2098177473. The cubic root of 421571640 is about 749.8201880048.
It can be divided in two parts, 4215 and 71640, that added together give a triangular number (75855 = T389).
The spelling of 421571640 in words is "four hundred twenty-one million, five hundred seventy-one thousand, six hundred forty".
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