390112820 has 12 divisors (see below), whose sum is σ = 819236964. Its totient is φ = 156045120.

The previous prime is 390112819. The next prime is 390112841. The reversal of 390112820 is 28211093.

It can be written as a sum of positive squares in 2 ways, for example, as 154306084 + 235806736 = 12422^2 + 15356^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 390112820.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9752801 + ... + 9752840.

It is an arithmetic number, because the mean of its divisors is an integer number (68269747).

Almost surely, 2^390112820 is an apocalyptic number.

It is an amenable number.

390112820 is an abundant number, since it is smaller than the sum of its proper divisors (429124144).

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

390112820 is a wasteful number, since it uses less digits than its factorization.

390112820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19505650 (or 19505648 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 390112820 is about 19751.2738829677. The cubic root of 390112820 is about 730.6848018206.

The spelling of 390112820 in words is "three hundred ninety million, one hundred twelve thousand, eight hundred twenty".