172443871 has 4 divisors (see below), whose sum is σ = 174521592. Its totient is φ = 170366152.

The previous prime is 172443853. The next prime is 172443883. The reversal of 172443871 is 178344271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 172443871 - 2⁵ = 172443839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172443871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172443841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1038736 + ... + 1038901.

It is an arithmetic number, because the mean of its divisors is an integer number (43630398).

Almost surely, 2^172443871 is an apocalyptic number.

172443871 is a deficient number, since it is larger than the sum of its proper divisors (2077721).

172443871 is an equidigital number, since it uses as much as digits as its factorization.

172443871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2077720.

The product of its digits is 37632, while the sum is 37.

The square root of 172443871 is about 13131.7885682035. The cubic root of 172443871 is about 556.6077569622.

It can be divided in two parts, 17244 and 3871, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 172443871 in words is "one hundred seventy-two million, four hundred forty-three thousand, eight hundred seventy-one".