397993920 has 56 divisors (see below), whose sum is σ = 1263633744. Its totient is φ = 106131456.

The previous prime is 397993891. The next prime is 397993927. The reversal of 397993920 is 29399793.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397993927) 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, 206329 + ... + 208248.

Almost surely, 2^397993920 is an apocalyptic number.

397993920 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

397993920 is an abundant number, since it is smaller than the sum of its proper divisors (865639824).

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

397993920 is a wasteful number, since it uses less digits than its factorization.

397993920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414597 (or 414587 counting only the distinct ones).

The product of its (nonzero) digits is 826686, while the sum is 51.

The square root of 397993920 is about 19949.7849612471. The cubic root of 397993920 is about 735.5724911732.

The spelling of 397993920 in words is "three hundred ninety-seven million, nine hundred ninety-three thousand, nine hundred twenty".