172156838 has 16 divisors (see below), whose sum is σ = 296140320. Its totient is φ = 73527936.

The previous prime is 172156811. The next prime is 172156843. The reversal of 172156838 is 838651271.

172156838 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 172156795 and 172156804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16883 + ... + 25086.

It is an arithmetic number, because the mean of its divisors is an integer number (18508770).

Almost surely, 2^172156838 is an apocalyptic number.

172156838 is a deficient number, since it is larger than the sum of its proper divisors (123983482).

172156838 is a wasteful number, since it uses less digits than its factorization.

172156838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42271.

The product of its digits is 80640, while the sum is 41.

The square root of 172156838 is about 13120.8550788430. The cubic root of 172156838 is about 556.2987607299.

The spelling of 172156838 in words is "one hundred seventy-two million, one hundred fifty-six thousand, eight hundred thirty-eight".