390992648 has 12 divisors (see below), whose sum is σ = 733216095. Its totient is φ = 195468360.

The previous prime is 390992611. The next prime is 390992681. The reversal of 390992648 is 846299093.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 195496324 + 195496324 = 13982^2 + 13982^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=13982.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 390992596 and 390992605.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 52433 + ... + 59423.

Almost surely, 2^390992648 is an apocalyptic number.

It is an amenable number.

390992648 is a deficient number, since it is larger than the sum of its proper divisors (342223447).

390992648 is an frugal number, since it uses more digits than its factorization.

390992648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13988 (or 6993 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 50.

The square root of 390992648 is about 19773.5340291006. The cubic root of 390992648 is about 731.2336979540.

Multiplying 390992648 by its sum of digits (50), we get a square (19549632400 = 139820²).

Multiplying 390992648 by its product of nonzero digits (839808), we get a square (328358753731584 = 18120672²).

The spelling of 390992648 in words is "three hundred ninety million, nine hundred ninety-two thousand, six hundred forty-eight".