172123144 has 16 divisors (see below), whose sum is σ = 325054800. Its totient is φ = 85441872.

The previous prime is 172123121. The next prime is 172123157. The reversal of 172123144 is 441321271.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76282 + ... + 78505.

It is an arithmetic number, because the mean of its divisors is an integer number (20315925).

Almost surely, 2^172123144 is an apocalyptic number.

It is an amenable number.

172123144 is a deficient number, since it is larger than the sum of its proper divisors (152931656).

172123144 is a wasteful number, since it uses less digits than its factorization.

172123144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154932 (or 154928 counting only the distinct ones).

The product of its digits is 1344, while the sum is 25.

The square root of 172123144 is about 13119.5710295726. The cubic root of 172123144 is about 556.2624660086.

The spelling of 172123144 in words is "one hundred seventy-two million, one hundred twenty-three thousand, one hundred forty-four".