172874239 has 2 divisors, whose sum is σ = 172874240. Its totient is φ = 172874238.

The previous prime is 172874237. The next prime is 172874243. The reversal of 172874239 is 932478271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172874239 - 2¹ = 172874237 is a prime.

Together with 172874237, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 172874195 and 172874204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172874231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86437119 + 86437120.

It is an arithmetic number, because the mean of its divisors is an integer number (86437120).

Almost surely, 2^172874239 is an apocalyptic number.

172874239 is a deficient number, since it is larger than the sum of its proper divisors (1).

172874239 is an equidigital number, since it uses as much as digits as its factorization.

172874239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 43.

The square root of 172874239 is about 13148.1648529367. The cubic root of 172874239 is about 557.0704141024.

The spelling of 172874239 in words is "one hundred seventy-two million, eight hundred seventy-four thousand, two hundred thirty-nine".