123172406 has 32 divisors (see below), whose sum is σ = 221667840. Its totient is φ = 50187456.

The previous prime is 123172397. The next prime is 123172409. The reversal of 123172406 is 604271321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123172409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56570 + ... + 58706.

It is an arithmetic number, because the mean of its divisors is an integer number (6927120).

Almost surely, 2^123172406 is an apocalyptic number.

123172406 is a deficient number, since it is larger than the sum of its proper divisors (98495434).

123172406 is a wasteful number, since it uses less digits than its factorization.

123172406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2348.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 123172406 is about 11098.3064473820. The cubic root of 123172406 is about 497.5512346753.

It can be divided in two parts, 1231 and 72406, that added together give a palindrome (73637).

The spelling of 123172406 in words is "one hundred twenty-three million, one hundred seventy-two thousand, four hundred six".