399044672 has 112 divisors (see below), whose sum is σ = 915954480. Its totient is φ = 170852352.

The previous prime is 399044609. The next prime is 399044683. The reversal of 399044672 is 276440993.

It can be written as a sum of positive squares in 8 ways, for example, as 87310336 + 311734336 = 9344^2 + 17656^2 .

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, 1258658 + ... + 1258974.

It is an arithmetic number, because the mean of its divisors is an integer number (8178165).

Almost surely, 2^399044672 is an apocalyptic number.

399044672 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399044672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (457977240).

399044672 is an abundant number, since it is smaller than the sum of its proper divisors (516909808).

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

399044672 is a wasteful number, since it uses less digits than its factorization.

399044672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448 (or 438 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 44.

The square root of 399044672 is about 19976.1025227645. The cubic root of 399044672 is about 736.2192557228.

The spelling of 399044672 in words is "three hundred ninety-nine million, forty-four thousand, six hundred seventy-two".