390909680 has 40 divisors (see below), whose sum is σ = 1038704352. Its totient is φ = 134025984.

The previous prime is 390909653. The next prime is 390909731. The reversal of 390909680 is 86909093.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 348467 + ... + 349586.

Almost surely, 2^390909680 is an apocalyptic number.

It is an amenable number.

390909680 is an abundant number, since it is smaller than the sum of its proper divisors (647794672).

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

390909680 is a wasteful number, since it uses less digits than its factorization.

390909680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698073 (or 698067 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 390909680 is about 19771.4359620135. The cubic root of 390909680 is about 731.1819720971.

The spelling of 390909680 in words is "three hundred ninety million, nine hundred nine thousand, six hundred eighty".