401597172 has 18 divisors (see below), whose sum is σ = 1015148498. Its totient is φ = 133865712.

The previous prime is 401597143. The next prime is 401597179. The reversal of 401597172 is 271795104.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 206324496 + 195272676 = 14364^2 + 13974^2 .

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

It is a super-2 number, since 2×401597172² = 322560577116795168, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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: 11155477 = 401597172 / (4 + 0 + 1 + 5 + 9 + 7 + 1 + 7 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401597179) 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, 5577703 + ... + 5577774.

Almost surely, 2^401597172 is an apocalyptic number.

It is an amenable number.

401597172 is an abundant number, since it is smaller than the sum of its proper divisors (613551326).

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

401597172 is a wasteful number, since it uses less digits than its factorization.

401597172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11155487 (or 11155482 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The square root of 401597172 is about 20039.8895206536. The cubic root of 401597172 is about 737.7856693571.

The spelling of 401597172 in words is "four hundred one million, five hundred ninety-seven thousand, one hundred seventy-two".