399086172 has 72 divisors (see below), whose sum is σ = 1029581280. Its totient is φ = 130314240.

The previous prime is 399086167. The next prime is 399086183. The reversal of 399086172 is 271680993.

It is a super-2 number, since 2×399086172² = 318539545363227168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 492904 + ... + 493712.

It is an arithmetic number, because the mean of its divisors is an integer number (14299740).

Almost surely, 2^399086172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399086172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (514790640).

399086172 is an abundant number, since it is smaller than the sum of its proper divisors (630495108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399086172 is a wasteful number, since it uses less digits than its factorization.

399086172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083 (or 1078 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 399086172 is about 19977.1412369238. The cubic root of 399086172 is about 736.2447767085.

The spelling of 399086172 in words is "three hundred ninety-nine million, eighty-six thousand, one hundred seventy-two".