394397172 has 36 divisors (see below), whose sum is σ = 1073638020. Its totient is φ = 121352832.

The previous prime is 394397153. The next prime is 394397183. The reversal of 394397172 is 271793493.

394397172 is a `hidden beast` number, since 3 + 94 + 397 + 172 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 22524516 + 371872656 = 4746^2 + 19284^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 420897 + ... + 421832.

Almost surely, 2^394397172 is an apocalyptic number.

It is an amenable number.

394397172 is an abundant number, since it is smaller than the sum of its proper divisors (679240848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

394397172 is a wasteful number, since it uses less digits than its factorization.

394397172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842752 (or 842747 counting only the distinct ones).

The product of its digits is 285768, while the sum is 45.

The square root of 394397172 is about 19859.4353394048. The cubic root of 394397172 is about 733.3499455374.

The spelling of 394397172 in words is "three hundred ninety-four million, three hundred ninety-seven thousand, one hundred seventy-two".