815172 has 12 divisors (see below), whose sum is σ = 1902096. Its totient is φ = 271720.

The previous prime is 815159. The next prime is 815173. The reversal of 815172 is 271518.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (815173) by changing a digit.

815172 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33954 + ... + 33977.

It is an arithmetic number, because the mean of its divisors is an integer number (158508).

2⁸¹⁵¹⁷² is an apocalyptic number.

It is an amenable number.

815172 is an abundant number, since it is smaller than the sum of its proper divisors (1086924).

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

815172 is a wasteful number, since it uses less digits than its factorization.

815172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67938 (or 67936 counting only the distinct ones).

The product of its digits is 560, while the sum is 24.

The square root of 815172 is about 902.8687612272. The cubic root of 815172 is about 93.4149569409.

It can be divided in two parts, 81 and 5172, that added together give a triangular number (5253 = T₁₀₂).

The spelling of 815172 in words is "eight hundred fifteen thousand, one hundred seventy-two".