397920688 has 20 divisors (see below), whose sum is σ = 841060008. Its totient is φ = 180872960.

The previous prime is 397920647. The next prime is 397920689. The reversal of 397920688 is 886029793.

It is not an unprimeable number, because it can be changed into a prime (397920689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1130281 + ... + 1130632.

Almost surely, 2^397920688 is an apocalyptic number.

It is an amenable number.

397920688 is an abundant number, since it is smaller than the sum of its proper divisors (443139320).

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

397920688 is a wasteful number, since it uses less digits than its factorization.

397920688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2260932 (or 2260926 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 52.

The square root of 397920688 is about 19947.9494685544. The cubic root of 397920688 is about 735.5273726038.

The spelling of 397920688 in words is "three hundred ninety-seven million, nine hundred twenty thousand, six hundred eighty-eight".