172472389 has 2 divisors, whose sum is σ = 172472390. Its totient is φ = 172472388.

The previous prime is 172472387. The next prime is 172472401. The reversal of 172472389 is 983274271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154579489 + 17892900 = 12433^2 + 4230^2 .

It is a cyclic number.

It is not a de Polignac number, because 172472389 - 2¹ = 172472387 is a prime.

Together with 172472387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172472381) 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, 86236194 + 86236195.

It is an arithmetic number, because the mean of its divisors is an integer number (86236195).

Almost surely, 2^172472389 is an apocalyptic number.

It is an amenable number.

172472389 is a deficient number, since it is larger than the sum of its proper divisors (1).

172472389 is an equidigital number, since it uses as much as digits as its factorization.

172472389 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 172472389 is about 13132.8743616925. The cubic root of 172472389 is about 556.6384383756.

The spelling of 172472389 in words is "one hundred seventy-two million, four hundred seventy-two thousand, three hundred eighty-nine".