399426004 has 24 divisors (see below), whose sum is σ = 732695040. Its totient is φ = 190163424.

The previous prime is 399425993. The next prime is 399426007. The reversal of 399426004 is 400624993.

It is a super-2 number, since 2×399426004² = 319082265342816032, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399426007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10782 + ... + 30250.

It is an arithmetic number, because the mean of its divisors is an integer number (30528960).

Almost surely, 2^399426004 is an apocalyptic number.

It is an amenable number.

399426004 is a deficient number, since it is larger than the sum of its proper divisors (333269036).

399426004 is a wasteful number, since it uses less digits than its factorization.

399426004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19719 (or 19717 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 399426004 is about 19985.6449483123. The cubic root of 399426004 is about 736.4536944552.

The spelling of 399426004 in words is "three hundred ninety-nine million, four hundred twenty-six thousand, four".