390631400 has 24 divisors (see below), whose sum is σ = 908218470. Its totient is φ = 156252480.

The previous prime is 390631391. The next prime is 390631441. The reversal of 390631400 is 4136093.

It can be written as a sum of positive squares in 3 ways, for example, as 337603876 + 53027524 = 18374^2 + 7282^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 390631400.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 976379 + ... + 976778.

Almost surely, 2^390631400 is an apocalyptic number.

It is an amenable number.

390631400 is an abundant number, since it is smaller than the sum of its proper divisors (517587070).

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

390631400 is a wasteful number, since it uses less digits than its factorization.

390631400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1953173 (or 1953164 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 390631400 is about 19764.3972840054. The cubic root of 390631400 is about 731.0084267903.

Adding to 390631400 its reverse (4136093), we get a palindrome (394767493).

The spelling of 390631400 in words is "three hundred ninety million, six hundred thirty-one thousand, four hundred".