172538 has 4 divisors (see below), whose sum is σ = 258810. Its totient is φ = 86268.

The previous prime is 172519. The next prime is 172541. The reversal of 172538 is 835271.

172538 is an esthetic number in base 5, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 165649 + 6889 = 407^2 + 83^2 .

It is a super-2 number, since 2×172538² = 59538722888, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 172538.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43133 + ... + 43136.

2¹⁷²⁵³⁸ is an apocalyptic number.

172538 is a deficient number, since it is larger than the sum of its proper divisors (86272).

172538 is an equidigital number, since it uses as much as digits as its factorization.

172538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86271.

The product of its digits is 1680, while the sum is 26.

The square root of 172538 is about 415.3769372510. The cubic root of 172538 is about 55.6709013874.

The spelling of 172538 in words is "one hundred seventy-two thousand, five hundred thirty-eight".