172394389 has 2 divisors, whose sum is σ = 172394390. Its totient is φ = 172394388.

The previous prime is 172394377. The next prime is 172394393. The reversal of 172394389 is 983493271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158331889 + 14062500 = 12583^2 + 3750^2 .

It is a cyclic number.

It is not a de Polignac number, because 172394389 - 2⁹ = 172393877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172394309) 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 as a sum of consecutive naturals, namely, 86197194 + 86197195.

It is an arithmetic number, because the mean of its divisors is an integer number (86197195).

Almost surely, 2^172394389 is an apocalyptic number.

It is an amenable number.

172394389 is a deficient number, since it is larger than the sum of its proper divisors (1).

172394389 is an equidigital number, since it uses as much as digits as its factorization.

172394389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 46.

The square root of 172394389 is about 13129.9043789359. The cubic root of 172394389 is about 556.5545131644.

The spelling of 172394389 in words is "one hundred seventy-two million, three hundred ninety-four thousand, three hundred eighty-nine".