158172 has 36 divisors (see below), whose sum is σ = 430920. Its totient is φ = 45024.

The previous prime is 158161. The next prime is 158189. The reversal of 158172 is 271851.

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 454 + ... + 722.

It is an arithmetic number, because the mean of its divisors is an integer number (11970).

2¹⁵⁸¹⁷² is an apocalyptic number.

158172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 158172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215460).

158172 is an abundant number, since it is smaller than the sum of its proper divisors (272748).

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

158172 is a wasteful number, since it uses less digits than its factorization.

158172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290 (or 281 counting only the distinct ones).

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

The square root of 158172 is about 397.7084359176. The cubic root of 158172 is about 54.0808117883.

It can be divided in two parts, 1581 and 72, that added together give a triangular number (1653 = T₅₇).

The spelling of 158172 in words is "one hundred fifty-eight thousand, one hundred seventy-two".