390966780 has 24 divisors (see below), whose sum is σ = 1094707152. Its totient is φ = 104257792.

The previous prime is 390966773. The next prime is 390966809. The reversal of 390966780 is 87669093.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3257997 + ... + 3258116.

It is an arithmetic number, because the mean of its divisors is an integer number (45612798).

Almost surely, 2^390966780 is an apocalyptic number.

390966780 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

390966780 is an abundant number, since it is smaller than the sum of its proper divisors (703740372).

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

390966780 is a wasteful number, since it uses less digits than its factorization.

390966780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6516125 (or 6516123 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 390966780 is about 19772.8799116365. The cubic root of 390966780 is about 731.2175715037.

The spelling of 390966780 in words is "three hundred ninety million, nine hundred sixty-six thousand, seven hundred eighty".