394691969 has 16 divisors (see below), whose sum is σ = 476467200. Its totient is φ = 319772880.

The previous prime is 394691963. The next prime is 394691977. The reversal of 394691969 is 969196493.

It is a de Polignac number, because none of the positive numbers 2^k-394691969 is a prime.

It is a super-2 number, since 2×394691969² = 311563500786193922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394691963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11819 + ... + 30480.

It is an arithmetic number, because the mean of its divisors is an integer number (29779200).

Almost surely, 2^394691969 is an apocalyptic number.

It is an amenable number.

394691969 is a deficient number, since it is larger than the sum of its proper divisors (81775231).

394691969 is a wasteful number, since it uses less digits than its factorization.

394691969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42380.

The product of its digits is 2834352, while the sum is 56.

The square root of 394691969 is about 19866.8560421623. The cubic root of 394691969 is about 733.5326171665.

The spelling of 394691969 in words is "three hundred ninety-four million, six hundred ninety-one thousand, nine hundred sixty-nine".