172215789 has 8 divisors (see below), whose sum is σ = 239604672. Its totient is φ = 109818720.

The previous prime is 172215781. The next prime is 172215803. The reversal of 172215789 is 987512271.

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

It is not a de Polignac number, because 172215789 - 2³ = 172215781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172215789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172215781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1247872 + ... + 1248009.

It is an arithmetic number, because the mean of its divisors is an integer number (29950584).

Almost surely, 2^172215789 is an apocalyptic number.

It is an amenable number.

172215789 is a deficient number, since it is larger than the sum of its proper divisors (67388883).

172215789 is a wasteful number, since it uses less digits than its factorization.

172215789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2495907.

The product of its digits is 70560, while the sum is 42.

The square root of 172215789 is about 13123.1013483856. The cubic root of 172215789 is about 556.3622505611.

The spelling of 172215789 in words is "one hundred seventy-two million, two hundred fifteen thousand, seven hundred eighty-nine".