399722904 has 128 divisors (see below), whose sum is σ = 1343692800. Its totient is φ = 107481600.

The previous prime is 399722861. The next prime is 399722927. The reversal of 399722904 is 409227993.

It is a self number, because there is not a number n which added to its sum of digits gives 399722904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17929 + ... + 33479.

It is an arithmetic number, because the mean of its divisors is an integer number (10497600).

Almost surely, 2^399722904 is an apocalyptic number.

399722904 is a gapful number since it is divisible by the number (34) 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 399722904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (671846400).

399722904 is an abundant number, since it is smaller than the sum of its proper divisors (943969896).

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

399722904 is a wasteful number, since it uses less digits than its factorization.

399722904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15590 (or 15580 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 399722904 is about 19993.0713998625. The cubic root of 399722904 is about 736.6361220270.

The spelling of 399722904 in words is "three hundred ninety-nine million, seven hundred twenty-two thousand, nine hundred four".