397936880 has 40 divisors (see below), whose sum is σ = 1009314864. Its totient is φ = 144704000.

The previous prime is 397936859. The next prime is 397936883. The reversal of 397936880 is 88639793.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397936883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225221 + ... + 226980.

Almost surely, 2^397936880 is an apocalyptic number.

It is an amenable number.

397936880 is an abundant number, since it is smaller than the sum of its proper divisors (611377984).

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

397936880 is a wasteful number, since it uses less digits than its factorization.

397936880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452225 (or 452219 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 53.

The square root of 397936880 is about 19948.3553206774. The cubic root of 397936880 is about 735.5373490455.

The spelling of 397936880 in words is "three hundred ninety-seven million, nine hundred thirty-six thousand, eight hundred eighty".