394379881 has 9 divisors (see below), whose sum is σ = 458930199. Its totient is φ = 337920744.

The previous prime is 394379813. The next prime is 394379897. The reversal of 394379881 is 188973493.

The square root of 394379881 is 19859.

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., 13505625 + 380874256 = 3675^2 + 19516^2 .

It is not a de Polignac number, because 394379881 - 2¹⁹ = 393855593 is a prime.

It is a super-2 number, since 2×394379881² = 311070981075148322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (394379801) by changing a digit.

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 8 ways as a sum of consecutive naturals, for example, 137595 + ... + 140431.

Almost surely, 2^394379881 is an apocalyptic number.

394379881 is the 19859-th square number.

394379881 is the 9930-th centered octagonal number.

It is an amenable number.

394379881 is a deficient number, since it is larger than the sum of its proper divisors (64550318).

394379881 is an frugal number, since it uses more digits than its factorization.

394379881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5688 (or 2844 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 52.

The cubic root of 394379881 is about 733.3392283043.

The spelling of 394379881 in words is "three hundred ninety-four million, three hundred seventy-nine thousand, eight hundred eighty-one".