172355 has 4 divisors (see below), whose sum is σ = 206832. Its totient is φ = 137880.

The previous prime is 172351. The next prime is 172357. The reversal of 172355 is 553271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 553271 = 167 ⋅3313.

It is not a de Polignac number, because 172355 - 2² = 172351 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172355.

It is not an unprimeable number, because it can be changed into a prime (172351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17231 + ... + 17240.

It is an arithmetic number, because the mean of its divisors is an integer number (51708).

2¹⁷²³⁵⁵ is an apocalyptic number.

172355 is a deficient number, since it is larger than the sum of its proper divisors (34477).

172355 is an equidigital number, since it uses as much as digits as its factorization.

172355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34476.

The product of its digits is 1050, while the sum is 23.

The square root of 172355 is about 415.1565969607. The cubic root of 172355 is about 55.6512122389.

The spelling of 172355 in words is "one hundred seventy-two thousand, three hundred fifty-five".