172218873 has 8 divisors (see below), whose sum is σ = 229722048. Its totient is φ = 114764144.

The previous prime is 172218863. The next prime is 172218929. The reversal of 172218873 is 378812271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172218873 - 2¹⁰ = 172217849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172218853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2790 + ... + 18767.

It is an arithmetic number, because the mean of its divisors is an integer number (28715256).

Almost surely, 2^172218873 is an apocalyptic number.

It is an amenable number.

172218873 is a deficient number, since it is larger than the sum of its proper divisors (57503175).

172218873 is a wasteful number, since it uses less digits than its factorization.

172218873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24223.

The product of its digits is 37632, while the sum is 39.

The square root of 172218873 is about 13123.2188505717. The cubic root of 172218873 is about 556.3655716096.

The spelling of 172218873 in words is "one hundred seventy-two million, two hundred eighteen thousand, eight hundred seventy-three".