| Base | Representation |
|---|---|
| bin | 10111101011001… |
| … | …111110010101000 |
| 3 | 1000200102111120200 |
| 4 | 113223033302220 |
| 5 | 1303141302330 |
| 6 | 103225352200 |
| 7 | 12562152633 |
| oct | 2753176250 |
| 9 | 1020374520 |
| 10 | 397212840 |
| 11 | 194241982 |
| 12 | b1038660 |
| 13 | 643a6aab |
| 14 | 3aa7ac1a |
| 15 | 24d12a60 |
| hex | 17acfca8 |
397212840 has 96 divisors (see below), whose sum is σ = 1298868480. Its totient is φ = 105273216.
The previous prime is 397212833. The next prime is 397212847. The reversal of 397212840 is 48212793.
It is an interprime number because it is at equal distance from previous prime (397212833) and next prime (397212847).
It is a Harshad number since it is a multiple of its sum of digits (36).
It is a junction number, because it is equal to n+sod(n) for n = 397212795 and 397212804.
It is not an unprimeable number, because it can be changed into a prime (397212847) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56817 + ... + 63423.
It is an arithmetic number, because the mean of its divisors is an integer number (13529880).
Almost surely, 2397212840 is an apocalyptic number.
397212840 is a gapful number since it is divisible by the number (30) 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 397212840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (649434240).
397212840 is an abundant number, since it is smaller than the sum of its proper divisors (901655640).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
397212840 is a wasteful number, since it uses less digits than its factorization.
397212840 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 6791 (or 6784 counting only the distinct ones).
The product of its (nonzero) digits is 24192, while the sum is 36.
The square root of 397212840 is about 19930.1991961947. The cubic root of 397212840 is about 735.0909786035.
The spelling of 397212840 in words is "three hundred ninety-seven million, two hundred twelve thousand, eight hundred forty".
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