399513687 has 8 divisors (see below), whose sum is σ = 532786800. Its totient is φ = 266291520.

The previous prime is 399513659. The next prime is 399513691. The reversal of 399513687 is 786315993.

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

It is not a de Polignac number, because 399513687 - 2⁶ = 399513623 is a prime.

It is a super-2 number, since 2×399513687² = 319222372200667938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399513607) 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, 12987 + ... + 31107.

It is an arithmetic number, because the mean of its divisors is an integer number (66598350).

Almost surely, 2^399513687 is an apocalyptic number.

399513687 is a deficient number, since it is larger than the sum of its proper divisors (133273113).

399513687 is a wasteful number, since it uses less digits than its factorization.

399513687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25473.

The product of its digits is 1224720, while the sum is 51.

The square root of 399513687 is about 19987.8384774342. The cubic root of 399513687 is about 736.5075799009.

The spelling of 399513687 in words is "three hundred ninety-nine million, five hundred thirteen thousand, six hundred eighty-seven".