172429 has 4 divisors (see below), whose sum is σ = 173340. Its totient is φ = 171520.

The previous prime is 172427. The next prime is 172433. The reversal of 172429 is 924271.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 924271 = 151 ⋅6121.

It can be written as a sum of positive squares in 2 ways, for example, as 81225 + 91204 = 285^2 + 302^2 .

It is a cyclic number.

It is not a de Polignac number, because 172429 - 2¹ = 172427 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 (172421) 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, 52 + ... + 589.

It is an arithmetic number, because the mean of its divisors is an integer number (43335).

2¹⁷²⁴²⁹ is an apocalyptic number.

It is an amenable number.

172429 is a deficient number, since it is larger than the sum of its proper divisors (911).

172429 is an equidigital number, since it uses as much as digits as its factorization.

172429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910.

The product of its digits is 1008, while the sum is 25.

The square root of 172429 is about 415.2457103933. The cubic root of 172429 is about 55.6591756487.

The spelling of 172429 in words is "one hundred seventy-two thousand, four hundred twenty-nine".