399138170 has 8 divisors (see below), whose sum is σ = 718448724. Its totient is φ = 159655264.

The previous prime is 399138167. The next prime is 399138191. The reversal of 399138170 is 71831993.

It can be written as a sum of positive squares in 2 ways, for example, as 357625921 + 41512249 = 18911^2 + 6443^2 .

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

It is a super-2 number, since 2×399138170² = 318622557501897800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19956899 + ... + 19956918.

Almost surely, 2^399138170 is an apocalyptic number.

399138170 is a deficient number, since it is larger than the sum of its proper divisors (319310554).

399138170 is a wasteful number, since it uses less digits than its factorization.

399138170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39913824.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 399138170 is about 19978.4426319971. The cubic root of 399138170 is about 736.2767510840.

The spelling of 399138170 in words is "three hundred ninety-nine million, one hundred thirty-eight thousand, one hundred seventy".