399581974 has 32 divisors (see below), whose sum is σ = 694396800. Its totient is φ = 170432640.

The previous prime is 399581953. The next prime is 399581983. The reversal of 399581974 is 479185993.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140337 + ... + 143155.

It is an arithmetic number, because the mean of its divisors is an integer number (21699900).

Almost surely, 2^399581974 is an apocalyptic number.

399581974 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

399581974 is a deficient number, since it is larger than the sum of its proper divisors (294814826).

399581974 is a wasteful number, since it uses less digits than its factorization.

399581974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3228.

The product of its digits is 2449440, while the sum is 55.

The square root of 399581974 is about 19989.5466181702. The cubic root of 399581974 is about 736.5495401053.

The spelling of 399581974 in words is "three hundred ninety-nine million, five hundred eighty-one thousand, nine hundred seventy-four".