172406839 has 4 divisors (see below), whose sum is σ = 188080200. Its totient is φ = 156733480.

The previous prime is 172406813. The next prime is 172406869. The reversal of 172406839 is 938604271.

172406839 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 172406839 - 2⁵ = 172406807 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172406869) 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, 7836664 + ... + 7836685.

It is an arithmetic number, because the mean of its divisors is an integer number (47020050).

Almost surely, 2^172406839 is an apocalyptic number.

172406839 is a deficient number, since it is larger than the sum of its proper divisors (15673361).

172406839 is a wasteful number, since it uses less digits than its factorization.

172406839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15673360.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 172406839 is about 13130.3784789320. The cubic root of 172406839 is about 556.5679106169.

The spelling of 172406839 in words is "one hundred seventy-two million, four hundred six thousand, eight hundred thirty-nine".