399642492 has 24 divisors (see below), whose sum is σ = 932822352. Its totient is φ = 133168000.

The previous prime is 399642437. The next prime is 399642497. The reversal of 399642492 is 294246993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399642497) 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 7 ways as a sum of consecutive naturals, for example, 65992 + ... + 71792.

It is an arithmetic number, because the mean of its divisors is an integer number (38867598).

Almost surely, 2^399642492 is an apocalyptic number.

It is an amenable number.

399642492 is an abundant number, since it is smaller than the sum of its proper divisors (533179860).

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

399642492 is a wasteful number, since it uses less digits than its factorization.

399642492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11549 (or 11547 counting only the distinct ones).

The product of its digits is 839808, while the sum is 48.

The square root of 399642492 is about 19991.0603020450. The cubic root of 399642492 is about 736.5867225091.

The spelling of 399642492 in words is "three hundred ninety-nine million, six hundred forty-two thousand, four hundred ninety-two".