394037172 has 18 divisors (see below), whose sum is σ = 996038498. Its totient is φ = 131345712.

The previous prime is 394037159. The next prime is 394037179. The reversal of 394037172 is 271730493.

It can be written as a sum of positive squares in only one way, i.e., 322058916 + 71978256 = 17946^2 + 8484^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 10945477 = 394037172 / (3 + 9 + 4 + 0 + 3 + 7 + 1 + 7 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394037179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5472703 + ... + 5472774.

Almost surely, 2^394037172 is an apocalyptic number.

It is an amenable number.

394037172 is an abundant number, since it is smaller than the sum of its proper divisors (602001326).

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

394037172 is a wasteful number, since it uses less digits than its factorization.

394037172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10945487 (or 10945482 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 36.

The square root of 394037172 is about 19850.3695683481. The cubic root of 394037172 is about 733.1267472263.

The spelling of 394037172 in words is "three hundred ninety-four million, thirty-seven thousand, one hundred seventy-two".