399504171 has 16 divisors (see below), whose sum is σ = 581454720. Its totient is φ = 241974720.

The previous prime is 399504169. The next prime is 399504191. The reversal of 399504171 is 171405993.

It is a happy number.

It is not a de Polignac number, because 399504171 - 2¹ = 399504169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399504151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76440 + ... + 81498.

It is an arithmetic number, because the mean of its divisors is an integer number (36340920).

Almost surely, 2^399504171 is an apocalyptic number.

399504171 is a deficient number, since it is larger than the sum of its proper divisors (181950549).

399504171 is a wasteful number, since it uses less digits than its factorization.

399504171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7466.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 399504171 is about 19987.6004312674. The cubic root of 399504171 is about 736.5017322399.

The spelling of 399504171 in words is "three hundred ninety-nine million, five hundred four thousand, one hundred seventy-one".