399964831 has 8 divisors (see below), whose sum is σ = 483991200. Its totient is φ = 322660608.

The previous prime is 399964811. The next prime is 399964847. The reversal of 399964831 is 138469993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399964831 - 2⁷ = 399964703 is a prime.

It is a super-2 number, since 2×399964831² = 319943732073717122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399964811) 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, 1680406 + ... + 1680643.

It is an arithmetic number, because the mean of its divisors is an integer number (60498900).

Almost surely, 2^399964831 is an apocalyptic number.

399964831 is a deficient number, since it is larger than the sum of its proper divisors (84026369).

399964831 is a wasteful number, since it uses less digits than its factorization.

399964831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3361073.

The product of its digits is 1259712, while the sum is 52.

The square root of 399964831 is about 19999.1207556732. The cubic root of 399964831 is about 736.7847051446.

The spelling of 399964831 in words is "three hundred ninety-nine million, nine hundred sixty-four thousand, eight hundred thirty-one".