390936722 has 54 divisors (see below), whose sum is σ = 682664661. Its totient is φ = 167772000.

The previous prime is 390936719. The next prime is 390936737. The reversal of 390936722 is 227639093.

It can be written as a sum of positive squares in 2 ways, for example, as 279190681 + 111746041 = 16709^2 + 10571^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=13981.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 390936722.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 9535022 + ... + 9535062.

Almost surely, 2^390936722 is an apocalyptic number.

390936722 is a deficient number, since it is larger than the sum of its proper divisors (291727939).

390936722 is a wasteful number, since it uses less digits than its factorization.

390936722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 41.

The square root of 390936722 is about 19772.1198155382. The cubic root of 390936722 is about 731.1988320590.

The spelling of 390936722 in words is "three hundred ninety million, nine hundred thirty-six thousand, seven hundred twenty-two".