399575928 has 32 divisors (see below), whose sum is σ = 1051516800. Its totient is φ = 126181728.

The previous prime is 399575927. The next prime is 399575929. The reversal of 399575928 is 829575993.

It is an interprime number because it is at equal distance from previous prime (399575927) and next prime (399575929).

It is a super-2 number, since 2×399575928² = 319321844474122368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399575923) 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, 437676 + ... + 438587.

It is an arithmetic number, because the mean of its divisors is an integer number (32859900).

Almost surely, 2^399575928 is an apocalyptic number.

399575928 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

399575928 is an abundant number, since it is smaller than the sum of its proper divisors (651940872).

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

399575928 is a wasteful number, since it uses less digits than its factorization.

399575928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876291 (or 876287 counting only the distinct ones).

The product of its digits is 6123600, while the sum is 57.

The square root of 399575928 is about 19989.3953885554. The cubic root of 399575928 is about 736.5458252221.

The spelling of 399575928 in words is "three hundred ninety-nine million, five hundred seventy-five thousand, nine hundred twenty-eight".