394936129 has 27 divisors (see below), whose sum is σ = 490969443. Its totient is φ = 316696128.

The previous prime is 394936127. The next prime is 394936133. The reversal of 394936129 is 921639493.

The square root of 394936129 is 19873.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 307476225 + 87459904 = 17535^2 + 9352^2 .

It is not a de Polignac number, because 394936129 - 2¹ = 394936127 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394936127) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2364804 + ... + 2364970.

Almost surely, 2^394936129 is an apocalyptic number.

394936129 is the 19873-rd square number.

394936129 is the 9937-th centered octagonal number.

It is an amenable number.

394936129 is a deficient number, since it is larger than the sum of its proper divisors (96033314).

394936129 is an equidigital number, since it uses as much as digits as its factorization.

394936129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382 (or 191 counting only the distinct ones).

The product of its digits is 314928, while the sum is 46.

The cubic root of 394936129 is about 733.6838426113.

The spelling of 394936129 in words is "three hundred ninety-four million, nine hundred thirty-six thousand, one hundred twenty-nine".