172889 has 4 divisors (see below), whose sum is σ = 175056. Its totient is φ = 170724.

The previous prime is 172883. The next prime is 172933. The reversal of 172889 is 988271.

It is a happy number.

172889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 172889 - 2⁸ = 172633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172883) 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, 959 + ... + 1124.

It is an arithmetic number, because the mean of its divisors is an integer number (43764).

2¹⁷²⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

172889 is a deficient number, since it is larger than the sum of its proper divisors (2167).

172889 is an equidigital number, since it uses as much as digits as its factorization.

172889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2166.

The product of its digits is 8064, while the sum is 35.

The square root of 172889 is about 415.7992303985. The cubic root of 172889 is about 55.7086268947.

The spelling of 172889 in words is "one hundred seventy-two thousand, eight hundred eighty-nine".