390815488 has 54 divisors (see below), whose sum is σ = 893461016. Its totient is φ = 167133696.

The previous prime is 390815459. The next prime is 390815539. The reversal of 390815488 is 884518093.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 836631 + ... + 837097.

Almost surely, 2^390815488 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 390815488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (446730508).

390815488 is an abundant number, since it is smaller than the sum of its proper divisors (502645528).

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

390815488 is an frugal number, since it uses more digits than its factorization.

390815488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957 (or 476 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 46.

The square root of 390815488 is about 19769.0537962746. The cubic root of 390815488 is about 731.1232398389.

The spelling of 390815488 in words is "three hundred ninety million, eight hundred fifteen thousand, four hundred eighty-eight".