172189144 has 16 divisors (see below), whose sum is σ = 326745720. Its totient is φ = 85056960.

The previous prime is 172189123. The next prime is 172189177. The reversal of 172189144 is 441981271.

It is a super-2 number, since 2×172189144² = 59298202622905472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 128997 + ... + 130324.

Almost surely, 2^172189144 is an apocalyptic number.

It is an amenable number.

172189144 is a deficient number, since it is larger than the sum of its proper divisors (154556576).

172189144 is a wasteful number, since it uses less digits than its factorization.

172189144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259410 (or 259406 counting only the distinct ones).

The product of its digits is 16128, while the sum is 37.

The square root of 172189144 is about 13122.0861146389. The cubic root of 172189144 is about 556.3335558697. Note that the first 3 decimals are identical.

It can be divided in two parts, 17218 and 9144, that added together give a palindrome (26362).

The spelling of 172189144 in words is "one hundred seventy-two million, one hundred eighty-nine thousand, one hundred forty-four".