172444387 has 2 divisors, whose sum is σ = 172444388. Its totient is φ = 172444386.

The previous prime is 172444381. The next prime is 172444403. The reversal of 172444387 is 783444271.

172444387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172444387 is a prime.

It is not a weakly prime, because it can be changed into another prime (172444381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86222193 + 86222194.

It is an arithmetic number, because the mean of its divisors is an integer number (86222194).

Almost surely, 2^172444387 is an apocalyptic number.

172444387 is a deficient number, since it is larger than the sum of its proper divisors (1).

172444387 is an equidigital number, since it uses as much as digits as its factorization.

172444387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 40.

The square root of 172444387 is about 13131.8082151698. The cubic root of 172444387 is about 556.6083121367.

The spelling of 172444387 in words is "one hundred seventy-two million, four hundred forty-four thousand, three hundred eighty-seven".