394131394 has 4 divisors (see below), whose sum is σ = 591197094. Its totient is φ = 197065696.

The previous prime is 394131379. The next prime is 394131407. The reversal of 394131394 is 493131493.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 375855769 + 18275625 = 19387^2 + 4275^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98532847 + ... + 98532850.

Almost surely, 2^394131394 is an apocalyptic number.

394131394 is a deficient number, since it is larger than the sum of its proper divisors (197065700).

394131394 is a wasteful number, since it uses less digits than its factorization.

394131394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197065699.

The product of its digits is 34992, while the sum is 37.

The square root of 394131394 is about 19852.7427324287. The cubic root of 394131394 is about 733.1851775539.

Subtracting 394131394 from its reverse (493131493), we obtain a palindrome (99000099).

The spelling of 394131394 in words is "three hundred ninety-four million, one hundred thirty-one thousand, three hundred ninety-four".