172445189 has 16 divisors (see below), whose sum is σ = 199701888. Its totient is φ = 145858752.

The previous prime is 172445183. The next prime is 172445227. The reversal of 172445189 is 981544271.

It is a cyclic number.

It is not a de Polignac number, because 172445189 - 2⁴ = 172445173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172445183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189674 + ... + 190580.

It is an arithmetic number, because the mean of its divisors is an integer number (12481368).

Almost surely, 2^172445189 is an apocalyptic number.

It is an amenable number.

172445189 is a deficient number, since it is larger than the sum of its proper divisors (27256699).

172445189 is a wasteful number, since it uses less digits than its factorization.

172445189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244.

The product of its digits is 80640, while the sum is 41.

The square root of 172445189 is about 13131.8387516753. The cubic root of 172445189 is about 556.6091750220.

The spelling of 172445189 in words is "one hundred seventy-two million, four hundred forty-five thousand, one hundred eighty-nine".