172259987 has 8 divisors (see below), whose sum is σ = 175057920. Its totient is φ = 169472520.

The previous prime is 172259959. The next prime is 172259993. The reversal of 172259987 is 789952271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172259987 - 2¹⁸ = 171997843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172259917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34814 + ... + 39452.

It is an arithmetic number, because the mean of its divisors is an integer number (21882240).

Almost surely, 2^172259987 is an apocalyptic number.

172259987 is a deficient number, since it is larger than the sum of its proper divisors (2797933).

172259987 is an equidigital number, since it uses as much as digits as its factorization.

172259987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5233.

The product of its digits is 635040, while the sum is 50.

The square root of 172259987 is about 13124.7852172902. The cubic root of 172259987 is about 556.4098420074.

The spelling of 172259987 in words is "one hundred seventy-two million, two hundred fifty-nine thousand, nine hundred eighty-seven".