172921876 has 12 divisors (see below), whose sum is σ = 304305120. Its totient is φ = 85977560.

The previous prime is 172921873. The next prime is 172921901. The reversal of 172921876 is 678129271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172921873) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 120040 + ... + 121471.

It is an arithmetic number, because the mean of its divisors is an integer number (25358760).

Almost surely, 2^172921876 is an apocalyptic number.

It is an amenable number.

172921876 is a deficient number, since it is larger than the sum of its proper divisors (131383244).

172921876 is a wasteful number, since it uses less digits than its factorization.

172921876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241694 (or 241692 counting only the distinct ones).

The product of its digits is 84672, while the sum is 43.

The square root of 172921876 is about 13149.9762737429. The cubic root of 172921876 is about 557.1215779356.

The spelling of 172921876 in words is "one hundred seventy-two million, nine hundred twenty-one thousand, eight hundred seventy-six".