164399 has 4 divisors (see below), whose sum is σ = 166560. Its totient is φ = 162240.

The previous prime is 164387. The next prime is 164413. The reversal of 164399 is 993461.

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-164399 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 (164309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 962 + ... + 1119.

It is an arithmetic number, because the mean of its divisors is an integer number (41640).

2¹⁶⁴³⁹⁹ is an apocalyptic number.

164399 is a deficient number, since it is larger than the sum of its proper divisors (2161).

164399 is an equidigital number, since it uses as much as digits as its factorization.

164399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2160.

The product of its digits is 5832, while the sum is 32.

The square root of 164399 is about 405.4614654933. The cubic root of 164399 is about 54.7813911988.

The spelling of 164399 in words is "one hundred sixty-four thousand, three hundred ninety-nine".