172854721 has 12 divisors (see below), whose sum is σ = 189444528. Its totient is φ = 157623024.

The previous prime is 172854697. The next prime is 172854727. The reversal of 172854721 is 127458271.

It is a de Polignac number, because none of the positive numbers 2^k-172854721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172854727) 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 11 ways as a sum of consecutive naturals, for example, 7866 + ... + 20188.

It is an arithmetic number, because the mean of its divisors is an integer number (15787044).

Almost surely, 2^172854721 is an apocalyptic number.

It is an amenable number.

172854721 is a deficient number, since it is larger than the sum of its proper divisors (16589807).

172854721 is a wasteful number, since it uses less digits than its factorization.

172854721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12432 (or 12419 counting only the distinct ones).

The product of its digits is 31360, while the sum is 37.

The square root of 172854721 is about 13147.4225991257. The cubic root of 172854721 is about 557.0494483614.

The spelling of 172854721 in words is "one hundred seventy-two million, eight hundred fifty-four thousand, seven hundred twenty-one".