397880928 has 72 divisors (see below), whose sum is σ = 1170514800. Its totient is φ = 128050944.

The previous prime is 397880921. The next prime is 397880941. The reversal of 397880928 is 829088793.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×397880928² = 316618465732282368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397880921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15468 + ... + 32171.

It is an arithmetic number, because the mean of its divisors is an integer number (16257150).

Almost surely, 2^397880928 is an apocalyptic number.

It is an amenable number.

397880928 is an abundant number, since it is smaller than the sum of its proper divisors (772633872).

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

397880928 is a wasteful number, since it uses less digits than its factorization.

397880928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47684 (or 47673 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The square root of 397880928 is about 19946.9528499969. The cubic root of 397880928 is about 735.5028739676.

The spelling of 397880928 in words is "three hundred ninety-seven million, eight hundred eighty thousand, nine hundred twenty-eight".