390391240 has 32 divisors (see below), whose sum is σ = 879180480. Its totient is φ = 156014272.

The previous prime is 390391237. The next prime is 390391273. The reversal of 390391240 is 42193093.

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, 47517 + ... + 55123.

It is an arithmetic number, because the mean of its divisors is an integer number (27474390).

Almost surely, 2^390391240 is an apocalyptic number.

It is an amenable number.

390391240 is an abundant number, since it is smaller than the sum of its proper divisors (488789240).

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

390391240 is a wasteful number, since it uses less digits than its factorization.

390391240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8901 (or 8897 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 390391240 is about 19758.3207788516. The cubic root of 390391240 is about 730.8585882008.

The spelling of 390391240 in words is "three hundred ninety million, three hundred ninety-one thousand, two hundred forty".