390838638 has 16 divisors (see below), whose sum is σ = 806893056. Its totient is φ = 126076920.

The previous prime is 390838621. The next prime is 390838663. The reversal of 390838638 is 836838093.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1050456 + ... + 1050827.

It is an arithmetic number, because the mean of its divisors is an integer number (50430816).

Almost surely, 2^390838638 is an apocalyptic number.

390838638 is an abundant number, since it is smaller than the sum of its proper divisors (416054418).

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

390838638 is a wasteful number, since it uses less digits than its factorization.

390838638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2101319.

The product of its (nonzero) digits is 746496, while the sum is 48.

The square root of 390838638 is about 19769.6392986822. The cubic root of 390838638 is about 731.1376756101.

The spelling of 390838638 in words is "three hundred ninety million, eight hundred thirty-eight thousand, six hundred thirty-eight".