172656423 has 24 divisors (see below), whose sum is σ = 260807040. Its totient is φ = 109858320.

The previous prime is 172656397. The next prime is 172656433. The reversal of 172656423 is 324656271.

172656423 is a `hidden beast` number, since 1 + 7 + 2 + 6 + 5 + 642 + 3 = 666.

It is not a de Polignac number, because 172656423 - 2⁹ = 172655911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172656433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 177328 + ... + 178298.

It is an arithmetic number, because the mean of its divisors is an integer number (10866960).

Almost surely, 2^172656423 is an apocalyptic number.

172656423 is a deficient number, since it is larger than the sum of its proper divisors (88150617).

172656423 is a wasteful number, since it uses less digits than its factorization.

172656423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1859 (or 1856 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 172656423 is about 13139.8791090329. The cubic root of 172656423 is about 556.8363521494.

The spelling of 172656423 in words is "one hundred seventy-two million, six hundred fifty-six thousand, four hundred twenty-three".