172820922 has 16 divisors (see below), whose sum is σ = 363833760. Its totient is φ = 54574992.

The previous prime is 172820911. The next prime is 172820951. The reversal of 172820922 is 229028271.

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 7 ways as a sum of consecutive naturals, for example, 757873 + ... + 758100.

It is an arithmetic number, because the mean of its divisors is an integer number (22739610).

Almost surely, 2^172820922 is an apocalyptic number.

172820922 is an abundant number, since it is smaller than the sum of its proper divisors (191012838).

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

172820922 is a wasteful number, since it uses less digits than its factorization.

172820922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515997.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 172820922 is about 13146.1371512700. The cubic root of 172820922 is about 557.0131385989.

The spelling of 172820922 in words is "one hundred seventy-two million, eight hundred twenty thousand, nine hundred twenty-two".