390181940 has 12 divisors (see below), whose sum is σ = 819382116. Its totient is φ = 156072768.

The previous prime is 390181933. The next prime is 390181969. The reversal of 390181940 is 49181093.

It can be written as a sum of positive squares in 2 ways, for example, as 254785444 + 135396496 = 15962^2 + 11636^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 390181940.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9754529 + ... + 9754568.

It is an arithmetic number, because the mean of its divisors is an integer number (68281843).

Almost surely, 2^390181940 is an apocalyptic number.

It is an amenable number.

390181940 is an abundant number, since it is smaller than the sum of its proper divisors (429200176).

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

390181940 is a wasteful number, since it uses less digits than its factorization.

390181940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19509106 (or 19509104 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 390181940 is about 19753.0235660265. The cubic root of 390181940 is about 730.7279533983.

The spelling of 390181940 in words is "three hundred ninety million, one hundred eighty-one thousand, nine hundred forty".