399650944 has 256 divisors, whose sum is σ = 1085736960. Its totient is φ = 141926400.

The previous prime is 399650939. The next prime is 399650969. The reversal of 399650944 is 449056993.

It is a super-2 number, since 2×399650944² = 319441754080182272, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9294187 + ... + 9294229.

It is an arithmetic number, because the mean of its divisors is an integer number (4241160).

Almost surely, 2^399650944 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 399650944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (542868480).

399650944 is an abundant number, since it is smaller than the sum of its proper divisors (686086016).

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

399650944 is a wasteful number, since it uses less digits than its factorization.

399650944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 49.

The square root of 399650944 is about 19991.2716954175. The cubic root of 399650944 is about 736.5919151393.

The spelling of 399650944 in words is "three hundred ninety-nine million, six hundred fifty thousand, nine hundred forty-four".