397391064 has 32 divisors (see below), whose sum is σ = 1135403520. Its totient is φ = 113540256.

The previous prime is 397391039. The next prime is 397391069. The reversal of 397391064 is 460193793.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397391069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1182544 + ... + 1182879.

It is an arithmetic number, because the mean of its divisors is an integer number (35481360).

Almost surely, 2^397391064 is an apocalyptic number.

It is an amenable number.

397391064 is an abundant number, since it is smaller than the sum of its proper divisors (738012456).

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

397391064 is a wasteful number, since it uses less digits than its factorization.

397391064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2365439 (or 2365435 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 42.

The square root of 397391064 is about 19934.6698994491. The cubic root of 397391064 is about 735.2009039399.

The spelling of 397391064 in words is "three hundred ninety-seven million, three hundred ninety-one thousand, sixty-four".