390812646 has 16 divisors (see below), whose sum is σ = 893286144. Its totient is φ = 111660744.

The previous prime is 390812641. The next prime is 390812683. The reversal of 390812646 is 646218093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390812641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4652490 + ... + 4652573.

It is an arithmetic number, because the mean of its divisors is an integer number (55830384).

Almost surely, 2^390812646 is an apocalyptic number.

390812646 is an abundant number, since it is smaller than the sum of its proper divisors (502473498).

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

390812646 is a wasteful number, since it uses less digits than its factorization.

390812646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9305075.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 390812646 is about 19768.9819161230. The cubic root of 390812646 is about 731.1214675983.

The spelling of 390812646 in words is "three hundred ninety million, eight hundred twelve thousand, six hundred forty-six".