399764304 has 90 divisors (see below), whose sum is σ = 1159044926. Its totient is φ = 128620800.

The previous prime is 399764303. The next prime is 399764327. The reversal of 399764304 is 403467993.

It can be written as a sum of positive squares in 3 ways, for example, as 26501904 + 373262400 = 5148^2 + 19320^2 .

It is a super-2 number, since 2×399764304² = 319622997505208832, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 399764304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399764303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 119454 + ... + 122754.

Almost surely, 2^399764304 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 399764304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (579522463).

399764304 is an abundant number, since it is smaller than the sum of its proper divisors (759280622).

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

399764304 is a wasteful number, since it uses less digits than its factorization.

399764304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3373 (or 3335 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 45.

The square root of 399764304 is about 19994.1067317347. The cubic root of 399764304 is about 736.6615527128.

The spelling of 399764304 in words is "three hundred ninety-nine million, seven hundred sixty-four thousand, three hundred four".