818172 has 18 divisors (see below), whose sum is σ = 2068248. Its totient is φ = 272712.

The previous prime is 818171. The next prime is 818173. The reversal of 818172 is 271818.

It is an interprime number because it is at equal distance from previous prime (818171) and next prime (818173).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818171) 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, 11328 + ... + 11399.

2⁸¹⁸¹⁷² is an apocalyptic number.

It is an amenable number.

818172 is an abundant number, since it is smaller than the sum of its proper divisors (1250076).

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

818172 is a wasteful number, since it uses less digits than its factorization.

818172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22737 (or 22732 counting only the distinct ones).

The product of its digits is 896, while the sum is 27.

The square root of 818172 is about 904.5286065128. The cubic root of 818172 is about 93.5294120439.

It can be divided in two parts, 818 and 172, that added together give a triangular number (990 = T₄₄).

The spelling of 818172 in words is "eight hundred eighteen thousand, one hundred seventy-two".