172538900 has 18 divisors (see below), whose sum is σ = 374409630. Its totient is φ = 69015520.

The previous prime is 172538857. The next prime is 172538911. The reversal of 172538900 is 9835271.

It can be written as a sum of positive squares in 3 ways, for example, as 456976 + 172081924 = 676^2 + 13118^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 862595 + ... + 862794.

It is an arithmetic number, because the mean of its divisors is an integer number (20800535).

Almost surely, 2^172538900 is an apocalyptic number.

172538900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172538900 is an abundant number, since it is smaller than the sum of its proper divisors (201870730).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172538900 is a wasteful number, since it uses less digits than its factorization.

172538900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725403 (or 1725396 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 172538900 is about 13135.4063507758. The cubic root of 172538900 is about 556.7099818487.

The spelling of 172538900 in words is "one hundred seventy-two million, five hundred thirty-eight thousand, nine hundred".