390391660 has 24 divisors (see below), whose sum is σ = 824359536. Its totient is φ = 155292480.

The previous prime is 390391619. The next prime is 390391667. The reversal of 390391660 is 66193093.

It is not an unprimeable number, because it can be changed into a prime (390391667) 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, 50302 + ... + 57541.

It is an arithmetic number, because the mean of its divisors is an integer number (34348314).

Almost surely, 2^390391660 is an apocalyptic number.

It is an amenable number.

390391660 is an abundant number, since it is smaller than the sum of its proper divisors (433967876).

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

390391660 is a wasteful number, since it uses less digits than its factorization.

390391660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108033 (or 108031 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 390391660 is about 19758.3314072823. The cubic root of 390391660 is about 730.8588502973.

The spelling of 390391660 in words is "three hundred ninety million, three hundred ninety-one thousand, six hundred sixty".