394129138 has 16 divisors (see below), whose sum is σ = 640949400. Its totient is φ = 180683136.

The previous prime is 394129097. The next prime is 394129159. The reversal of 394129138 is 831921493.

It can be written as a sum of positive squares in 4 ways, for example, as 111788329 + 282340809 = 10573^2 + 16803^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 394129138.

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, 46995 + ... + 54742.

Almost surely, 2^394129138 is an apocalyptic number.

394129138 is a deficient number, since it is larger than the sum of its proper divisors (246820262).

394129138 is a wasteful number, since it uses less digits than its factorization.

394129138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101901.

The product of its digits is 46656, while the sum is 40.

The square root of 394129138 is about 19852.6859140017. The cubic root of 394129138 is about 733.1837786390.

The spelling of 394129138 in words is "three hundred ninety-four million, one hundred twenty-nine thousand, one hundred thirty-eight".