399661132 has 12 divisors (see below), whose sum is σ = 753207616. Its totient is φ = 184458960.

The previous prime is 399661127. The next prime is 399661139. The reversal of 399661132 is 231166993.

It is not an unprimeable number, because it can be changed into a prime (399661139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3842844 + ... + 3842947.

Almost surely, 2^399661132 is an apocalyptic number.

It is an amenable number.

399661132 is a deficient number, since it is larger than the sum of its proper divisors (353546484).

399661132 is a wasteful number, since it uses less digits than its factorization.

399661132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7685808 (or 7685806 counting only the distinct ones).

The product of its digits is 52488, while the sum is 40.

The square root of 399661132 is about 19991.5265049971. The cubic root of 399661132 is about 736.5981742135.

The spelling of 399661132 in words is "three hundred ninety-nine million, six hundred sixty-one thousand, one hundred thirty-two".