399859924 has 24 divisors (see below), whose sum is σ = 758153088. Its totient is φ = 183792000.

The previous prime is 399859871. The next prime is 399859927. The reversal of 399859924 is 429958993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399859927) 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, 65452 + ... + 71299.

It is an arithmetic number, because the mean of its divisors is an integer number (31589712).

Almost surely, 2^399859924 is an apocalyptic number.

399859924 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

399859924 is a deficient number, since it is larger than the sum of its proper divisors (358293164).

399859924 is a wasteful number, since it uses less digits than its factorization.

399859924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136815 (or 136813 counting only the distinct ones).

The product of its digits is 6298560, while the sum is 58.

The square root of 399859924 is about 19996.4977933637. The cubic root of 399859924 is about 736.7202822871.

The spelling of 399859924 in words is "three hundred ninety-nine million, eight hundred fifty-nine thousand, nine hundred twenty-four".