172297399 has 4 divisors (see below), whose sum is σ = 172330264. Its totient is φ = 172264536.

The previous prime is 172297379. The next prime is 172297417. The reversal of 172297399 is 993792271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172297399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172297309) 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 in 3 ways as a sum of consecutive naturals, for example, 6612 + ... + 19705.

It is an arithmetic number, because the mean of its divisors is an integer number (43082566).

Almost surely, 2^172297399 is an apocalyptic number.

172297399 is a deficient number, since it is larger than the sum of its proper divisors (32865).

172297399 is an equidigital number, since it uses as much as digits as its factorization.

172297399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32864.

The product of its digits is 428652, while the sum is 49.

The square root of 172297399 is about 13126.2103822848. The cubic root of 172297399 is about 556.4501200750.

The spelling of 172297399 in words is "one hundred seventy-two million, two hundred ninety-seven thousand, three hundred ninety-nine".