390912644 has 12 divisors (see below), whose sum is σ = 695312268. Its totient is φ = 192252000.

The previous prime is 390912629. The next prime is 390912647. The reversal of 390912644 is 446219093.

It can be written as a sum of positive squares in 2 ways, for example, as 169260100 + 221652544 = 13010^2 + 14888^2 .

It is a junction number, because it is equal to n+sod(n) for n = 390912598 and 390912607.

It is not an unprimeable number, because it can be changed into a prime (390912647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800807 + ... + 801294.

It is an arithmetic number, because the mean of its divisors is an integer number (57942689).

Almost surely, 2^390912644 is an apocalyptic number.

It is an amenable number.

390912644 is a deficient number, since it is larger than the sum of its proper divisors (304399624).

390912644 is a wasteful number, since it uses less digits than its factorization.

390912644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1602166 (or 1602164 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 390912644 is about 19771.5109184908. The cubic root of 390912644 is about 731.1838201096.

The spelling of 390912644 in words is "three hundred ninety million, nine hundred twelve thousand, six hundred forty-four".