399263660 has 24 divisors (see below), whose sum is σ = 842222976. Its totient is φ = 158987520.

The previous prime is 399263659. The next prime is 399263713. The reversal of 399263660 is 66362993.

It is a super-2 number, since 2×399263660² = 318822940393191200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40301 + ... + 49220.

It is an arithmetic number, because the mean of its divisors is an integer number (35092624).

Almost surely, 2^399263660 is an apocalyptic number.

It is an amenable number.

399263660 is an abundant number, since it is smaller than the sum of its proper divisors (442959316).

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

399263660 is a wasteful number, since it uses less digits than its factorization.

399263660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89753 (or 89751 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 44.

The square root of 399263660 is about 19981.5830203715. The cubic root of 399263660 is about 736.3539053921.

The spelling of 399263660 in words is "three hundred ninety-nine million, two hundred sixty-three thousand, six hundred sixty".