397291620 has 96 divisors (see below), whose sum is σ = 1241856000. Its totient is φ = 94066560.

The previous prime is 397291613. The next prime is 397291637. The reversal of 397291620 is 26192793.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21381 + ... + 35379.

It is an arithmetic number, because the mean of its divisors is an integer number (12936000).

Almost surely, 2^397291620 is an apocalyptic number.

397291620 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 397291620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (620928000).

397291620 is an abundant number, since it is smaller than the sum of its proper divisors (844564380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

397291620 is a wasteful number, since it uses less digits than its factorization.

397291620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14065 (or 14063 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 397291620 is about 19932.1754959161. The cubic root of 397291620 is about 735.1395727352.

The spelling of 397291620 in words is "three hundred ninety-seven million, two hundred ninety-one thousand, six hundred twenty".