172156 has 12 divisors (see below), whose sum is σ = 304192. Its totient is φ = 85248.

The previous prime is 172153. The next prime is 172157. The reversal of 172156 is 651271.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

Its product of digits (420) is a multiple of the sum of its prime factors (420).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661 + ... + 883.

2¹⁷²¹⁵⁶ is an apocalyptic number.

It is an amenable number.

172156 is a deficient number, since it is larger than the sum of its proper divisors (132036).

172156 is a wasteful number, since it uses less digits than its factorization.

172156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420 (or 418 counting only the distinct ones).

The product of its digits is 420, while the sum is 22.

The square root of 172156 is about 414.9168591417. The cubic root of 172156 is about 55.6297858105.

The spelling of 172156 in words is "one hundred seventy-two thousand, one hundred fifty-six".