172385407 has 2 divisors, whose sum is σ = 172385408. Its totient is φ = 172385406.

The previous prime is 172385387. The next prime is 172385417. The reversal of 172385407 is 704583271.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172385407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172385417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86192703 + 86192704.

It is an arithmetic number, because the mean of its divisors is an integer number (86192704).

Almost surely, 2^172385407 is an apocalyptic number.

172385407 is a deficient number, since it is larger than the sum of its proper divisors (1).

172385407 is an equidigital number, since it uses as much as digits as its factorization.

172385407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 172385407 is about 13129.5623308624. The cubic root of 172385407 is about 556.5448472283.

The spelling of 172385407 in words is "one hundred seventy-two million, three hundred eighty-five thousand, four hundred seven".