| Base | Representation |
|---|---|
| bin | 100100011110011… |
| … | …0010001101010000 |
| 3 | 10011021222020201111 |
| 4 | 1020330302031100 |
| 5 | 10001304100330 |
| 6 | 321240143104 |
| 7 | 42220632421 |
| oct | 11074621520 |
| 9 | 3137866644 |
| 10 | 1223893840 |
| 11 | 578946614 |
| 12 | 2a1a67a94 |
| 13 | 16673c050 |
| 14 | b878d648 |
| 15 | 726aa32a |
| hex | 48f32350 |
1223893840 has 80 divisors (see below), whose sum is σ = 3070303488. Its totient is φ = 451035648.
The previous prime is 1223893819. The next prime is 1223893841. The reversal of 1223893840 is 483983221.
It is a tau number, because it is divible by the number of its divisors (80).
It is a super-2 number, since 2×12238938402 = 2995832263179891200, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (40).
It is a junction number, because it is equal to n+sod(n) for n = 1223893793 and 1223893802.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1223893841) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 859369 + ... + 860791.
Almost surely, 21223893840 is an apocalyptic number.
1223893840 is a gapful number since it is divisible by the number (10) 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 1223893840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1535151744).
1223893840 is an abundant number, since it is smaller than the sum of its proper divisors (1846409648).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1223893840 is a wasteful number, since it uses less digits than its factorization.
1223893840 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2276 (or 2270 counting only the distinct ones).
The product of its (nonzero) digits is 82944, while the sum is 40.
The square root of 1223893840 is about 34984.1941453566. The cubic root of 1223893840 is about 1069.6653217128.
The spelling of 1223893840 in words is "one billion, two hundred twenty-three million, eight hundred ninety-three thousand, eight hundred forty".
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