390998656 has 32 divisors (see below), whose sum is σ = 797068800. Its totient is φ = 190950144.

The previous prime is 390998653. The next prime is 390998669. The reversal of 390998656 is 656899093.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 390998597 and 390998606.

It is not an unprimeable number, because it can be changed into a prime (390998653) 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, 30016 + ... + 41023.

It is an arithmetic number, because the mean of its divisors is an integer number (24908400).

Almost surely, 2^390998656 is an apocalyptic number.

It is an amenable number.

390998656 is an abundant number, since it is smaller than the sum of its proper divisors (406070144).

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

390998656 is an equidigital number, since it uses as much as digits as its factorization.

390998656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71096 (or 71084 counting only the distinct ones).

The product of its (nonzero) digits is 3149280, while the sum is 55.

The square root of 390998656 is about 19773.6859487552. The cubic root of 390998656 is about 731.2374433181.

The spelling of 390998656 in words is "three hundred ninety million, nine hundred ninety-eight thousand, six hundred fifty-six".