172747439 has 2 divisors, whose sum is σ = 172747440. Its totient is φ = 172747438.

The previous prime is 172747427. The next prime is 172747441. The reversal of 172747439 is 934747271.

It is a strong prime.

It is an emirp because it is prime and its reverse (934747271) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172747439 is a prime.

Together with 172747441, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172747439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172747409) 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 as a sum of consecutive naturals, namely, 86373719 + 86373720.

It is an arithmetic number, because the mean of its divisors is an integer number (86373720).

Almost surely, 2^172747439 is an apocalyptic number.

172747439 is a deficient number, since it is larger than the sum of its proper divisors (1).

172747439 is an equidigital number, since it uses as much as digits as its factorization.

172747439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 296352, while the sum is 44.

The square root of 172747439 is about 13143.3420027024. The cubic root of 172747439 is about 556.9341805681.

The spelling of 172747439 in words is "one hundred seventy-two million, seven hundred forty-seven thousand, four hundred thirty-nine".