394180369 has 6 divisors (see below), whose sum is σ = 433272770. Its totient is φ = 358345680.

The previous prime is 394180361. The next prime is 394180379. The reversal of 394180369 is 963081493.

It can be written as a sum of positive squares in only one way, i.e., 392040000 + 2140369 = 19800^2 + 1463^2 .

It is not a de Polignac number, because 394180369 - 2³ = 394180361 is a prime.

It is a super-2 number, since 2×394180369² = 310756326609952322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394180361) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1628724 + ... + 1628965.

Almost surely, 2^394180369 is an apocalyptic number.

It is an amenable number.

394180369 is a deficient number, since it is larger than the sum of its proper divisors (39092401).

394180369 is a wasteful number, since it uses less digits than its factorization.

394180369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3257711 (or 3257700 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 394180369 is about 19853.9761508873. The cubic root of 394180369 is about 733.2155449707.

The spelling of 394180369 in words is "three hundred ninety-four million, one hundred eighty thousand, three hundred sixty-nine".