394081938 has 12 divisors (see below), whose sum is σ = 853844238. Its totient is φ = 131360640.

The previous prime is 394081927. The next prime is 394081969. The reversal of 394081938 is 839180493.

It can be written as a sum of positive squares in only one way, i.e., 198725409 + 195356529 = 14097^2 + 13977^2 .

It is a junction number, because it is equal to n+sod(n) for n = 394081893 and 394081902.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 10946703 + ... + 10946738.

Almost surely, 2^394081938 is an apocalyptic number.

394081938 is an abundant number, since it is smaller than the sum of its proper divisors (459762300).

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

394081938 is a wasteful number, since it uses less digits than its factorization.

394081938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21893449 (or 21893446 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 394081938 is about 19851.4971223835. The cubic root of 394081938 is about 733.1545093356.

The spelling of 394081938 in words is "three hundred ninety-four million, eighty-one thousand, nine hundred thirty-eight".