390936720 has 80 divisors (see below), whose sum is σ = 1217279232. Its totient is φ = 103787520.

The previous prime is 390936719. The next prime is 390936737. The reversal of 390936720 is 27639093.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52425 + ... + 59415.

Almost surely, 2^390936720 is an apocalyptic number.

390936720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 390936720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (608639616).

390936720 is an abundant number, since it is smaller than the sum of its proper divisors (826342512).

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

390936720 is a wasteful number, since it uses less digits than its factorization.

390936720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7240 (or 7234 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 39.

The square root of 390936720 is about 19772.1197649620. The cubic root of 390936720 is about 731.1988308121.

The spelling of 390936720 in words is "three hundred ninety million, nine hundred thirty-six thousand, seven hundred twenty".