399440632 has 32 divisors (see below), whose sum is σ = 783820800. Its totient is φ = 190473184.

The previous prime is 399440579. The next prime is 399440651. The reversal of 399440632 is 236044993.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63033 + ... + 69079.

It is an arithmetic number, because the mean of its divisors is an integer number (24494400).

Almost surely, 2^399440632 is an apocalyptic number.

It is an amenable number.

399440632 is a deficient number, since it is larger than the sum of its proper divisors (384380168).

399440632 is a wasteful number, since it uses less digits than its factorization.

399440632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6435 (or 6431 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 40.

The square root of 399440632 is about 19986.0109076324. The cubic root of 399440632 is about 736.4626846170.

The spelling of 399440632 in words is "three hundred ninety-nine million, four hundred forty thousand, six hundred thirty-two".