399503690 has 16 divisors (see below), whose sum is σ = 756954720. Its totient is φ = 151390800.

The previous prime is 399503659. The next prime is 399503693. The reversal of 399503690 is 96305993.

It is a super-2 number, since 2×399503690² = 319206396647232200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (399503693) 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, 1051136 + ... + 1051515.

It is an arithmetic number, because the mean of its divisors is an integer number (47309670).

Almost surely, 2^399503690 is an apocalyptic number.

399503690 is a deficient number, since it is larger than the sum of its proper divisors (357451030).

399503690 is a wasteful number, since it uses less digits than its factorization.

399503690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102677.

The product of its (nonzero) digits is 196830, while the sum is 44.

The square root of 399503690 is about 19987.5883988039. The cubic root of 399503690 is about 736.5014366589.

The spelling of 399503690 in words is "three hundred ninety-nine million, five hundred three thousand, six hundred ninety".