399765568 has 14 divisors (see below), whose sum is σ = 793284926. Its totient is φ = 199882752.

The previous prime is 399765559. The next prime is 399765577. The reversal of 399765568 is 865567993.

It is an interprime number because it is at equal distance from previous prime (399765559) and next prime (399765577).

It can be written as a sum of positive squares in only one way, i.e., 367412224 + 32353344 = 19168^2 + 5688^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3123105 + ... + 3123232.

It is an arithmetic number, because the mean of its divisors is an integer number (56663209).

Almost surely, 2^399765568 is an apocalyptic number.

It is an amenable number.

399765568 is a deficient number, since it is larger than the sum of its proper divisors (393519358).

399765568 is an equidigital number, since it uses as much as digits as its factorization.

399765568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6246349 (or 6246339 counting only the distinct ones).

The product of its digits is 12247200, while the sum is 58.

The square root of 399765568 is about 19994.1383410239. The cubic root of 399765568 is about 736.6623291196.

The spelling of 399765568 in words is "three hundred ninety-nine million, seven hundred sixty-five thousand, five hundred sixty-eight".