390722685 has 16 divisors (see below), whose sum is σ = 625648320. Its totient is φ = 208221440.

The previous prime is 390722681. The next prime is 390722711. The reversal of 390722685 is 586227093.

It is not a de Polignac number, because 390722685 - 2² = 390722681 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390722681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10846 + ... + 29984.

It is an arithmetic number, because the mean of its divisors is an integer number (39103020).

Almost surely, 2^390722685 is an apocalyptic number.

It is an amenable number.

390722685 is a deficient number, since it is larger than the sum of its proper divisors (234925635).

390722685 is a wasteful number, since it uses less digits than its factorization.

390722685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20508.

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 390722685 is about 19766.7064783185. The cubic root of 390722685 is about 731.0653644447.

The spelling of 390722685 in words is "three hundred ninety million, seven hundred twenty-two thousand, six hundred eighty-five".