172883821 has 16 divisors (see below), whose sum is σ = 193666176. Its totient is φ = 153000000.

The previous prime is 172883797. The next prime is 172883849. The reversal of 172883821 is 128388271.

It is a cyclic number.

It is not a de Polignac number, because 172883821 - 2⁹ = 172883309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172883861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66496 + ... + 69046.

It is an arithmetic number, because the mean of its divisors is an integer number (12104136).

Almost surely, 2^172883821 is an apocalyptic number.

172883821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

172883821 is a deficient number, since it is larger than the sum of its proper divisors (20782355).

172883821 is a wasteful number, since it uses less digits than its factorization.

172883821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2724.

The product of its digits is 43008, while the sum is 40.

The square root of 172883821 is about 13148.5292333401. The cubic root of 172883821 is about 557.0807062665.

The spelling of 172883821 in words is "one hundred seventy-two million, eight hundred eighty-three thousand, eight hundred twenty-one".