172808423 has 2 divisors, whose sum is σ = 172808424. Its totient is φ = 172808422.

The previous prime is 172808413. The next prime is 172808431. The reversal of 172808423 is 324808271.

It is a strong prime.

It is an emirp because it is prime and its reverse (324808271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172808423 - 2⁶ = 172808359 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172808413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86404211 + 86404212.

It is an arithmetic number, because the mean of its divisors is an integer number (86404212).

Almost surely, 2^172808423 is an apocalyptic number.

172808423 is a deficient number, since it is larger than the sum of its proper divisors (1).

172808423 is an equidigital number, since it uses as much as digits as its factorization.

172808423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 172808423 is about 13145.6617558798. The cubic root of 172808423 is about 556.9997099103. Note that the first 3 decimals are identical.

The spelling of 172808423 in words is "one hundred seventy-two million, eight hundred eight thousand, four hundred twenty-three".