397996440 has 32 divisors (see below), whose sum is σ = 1193989680. Its totient is φ = 106132352.

The previous prime is 397996421. The next prime is 397996447. The reversal of 397996440 is 44699793.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397996447) 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, 1658199 + ... + 1658438.

Almost surely, 2^397996440 is an apocalyptic number.

397996440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

397996440 is an abundant number, since it is smaller than the sum of its proper divisors (795993240).

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

397996440 is a wasteful number, since it uses less digits than its factorization.

397996440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3316651 (or 3316647 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 51.

The square root of 397996440 is about 19949.8481197226. The cubic root of 397996440 is about 735.5740436582.

The spelling of 397996440 in words is "three hundred ninety-seven million, nine hundred ninety-six thousand, four hundred forty".