172399 has 2 divisors, whose sum is σ = 172400. Its totient is φ = 172398.

The previous prime is 172373. The next prime is 172411. The reversal of 172399 is 993271.

172399 = 167² + 168² + ... + 172².

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172399 - 2¹¹ = 170351 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86199 + 86200.

It is an arithmetic number, because the mean of its divisors is an integer number (86200).

2¹⁷²³⁹⁹ is an apocalyptic number.

172399 is a deficient number, since it is larger than the sum of its proper divisors (1).

172399 is an equidigital number, since it uses as much as digits as its factorization.

172399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3402, while the sum is 31.

The square root of 172399 is about 415.2095856312. The cubic root of 172399 is about 55.6559475139.

The spelling of 172399 in words is "one hundred seventy-two thousand, three hundred ninety-nine".