390399492 has 96 divisors (see below), whose sum is σ = 1137991680. Its totient is φ = 101583360.

The previous prime is 390399481. The next prime is 390399551. The reversal of 390399492 is 294993093.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39859 + ... + 48677.

It is an arithmetic number, because the mean of its divisors is an integer number (11854080).

Almost surely, 2^390399492 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 390399492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (568995840).

390399492 is an abundant number, since it is smaller than the sum of its proper divisors (747592188).

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

390399492 is a wasteful number, since it uses less digits than its factorization.

390399492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8881 (or 8879 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 48.

The square root of 390399492 is about 19758.5296011621. The cubic root of 390399492 is about 730.8637377380.

The spelling of 390399492 in words is "three hundred ninety million, three hundred ninety-nine thousand, four hundred ninety-two".