172668423 has 4 divisors (see below), whose sum is σ = 230224568. Its totient is φ = 115112280.

The previous prime is 172668421. The next prime is 172668437. The reversal of 172668423 is 324866271.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 324866271 = 3 ⋅108288757.

It is not a de Polignac number, because 172668423 - 2¹ = 172668421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172668421) 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 3 ways as a sum of consecutive naturals, for example, 28778068 + ... + 28778073.

It is an arithmetic number, because the mean of its divisors is an integer number (57556142).

Almost surely, 2^172668423 is an apocalyptic number.

172668423 is a deficient number, since it is larger than the sum of its proper divisors (57556145).

172668423 is an equidigital number, since it uses as much as digits as its factorization.

172668423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57556144.

The product of its digits is 96768, while the sum is 39.

The square root of 172668423 is about 13140.3357263047. The cubic root of 172668423 is about 556.8492522997.

The spelling of 172668423 in words is "one hundred seventy-two million, six hundred sixty-eight thousand, four hundred twenty-three".