170399 has 4 divisors (see below), whose sum is σ = 172536. Its totient is φ = 168264.

The previous prime is 170393. The next prime is 170413. The reversal of 170399 is 993071.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993071 = 23 ⋅43177.

It is a cyclic number.

It is not a de Polignac number, because 170399 - 2⁴ = 170383 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (170393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 944 + ... + 1109.

It is an arithmetic number, because the mean of its divisors is an integer number (43134).

2¹⁷⁰³⁹⁹ is an apocalyptic number.

170399 is a deficient number, since it is larger than the sum of its proper divisors (2137).

170399 is an equidigital number, since it uses as much as digits as its factorization.

170399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136.

The product of its (nonzero) digits is 1701, while the sum is 29.

The square root of 170399 is about 412.7941375553. The cubic root of 170399 is about 55.4398883841.

It can be divided in two parts, 17039 and 9, that multiplied together give a palindrome (153351).

The spelling of 170399 in words is "one hundred seventy thousand, three hundred ninety-nine".