172979 has 4 divisors (see below), whose sum is σ = 177240. Its totient is φ = 168720.

The previous prime is 172973. The next prime is 172981. The reversal of 172979 is 979271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 979271 = 23 ⋅42577.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172979 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172973) 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, 2069 + ... + 2150.

It is an arithmetic number, because the mean of its divisors is an integer number (44310).

2¹⁷²⁹⁷⁹ is an apocalyptic number.

172979 is a deficient number, since it is larger than the sum of its proper divisors (4261).

172979 is an equidigital number, since it uses as much as digits as its factorization.

172979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4260.

The product of its digits is 7938, while the sum is 35.

The square root of 172979 is about 415.9074416261. The cubic root of 172979 is about 55.7182918756.

The spelling of 172979 in words is "one hundred seventy-two thousand, nine hundred seventy-nine".