863172 has 18 divisors (see below), whose sum is σ = 2181998. Its totient is φ = 287712.

The previous prime is 863153. The next prime is 863179. The reversal of 863172 is 271368.

863172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 715716 + 147456 = 846^2 + 384^2 .

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

It is not an unprimeable number, because it can be changed into a prime (863179) by changing a digit.

863172 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11953 + ... + 12024.

2⁸⁶³¹⁷² is an apocalyptic number.

It is an amenable number.

863172 is an abundant number, since it is smaller than the sum of its proper divisors (1318826).

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

863172 is a wasteful number, since it uses less digits than its factorization.

863172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23987 (or 23982 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 863172 is about 929.0705032450. The cubic root of 863172 is about 95.2136282069.

It can be divided in two parts, 863 and 172, that added together give a triangular number (1035 = T₄₅).

The spelling of 863172 in words is "eight hundred sixty-three thousand, one hundred seventy-two".