65399 has 4 divisors (see below), whose sum is σ = 69264. Its totient is φ = 61536.

The previous prime is 65393. The next prime is 65407. The reversal of 65399 is 99356.

65399 is nontrivially palindromic in base 11.

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-65399 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a nialpdrome in base 16.

It is a zygodrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 65399.

It is not an unprimeable number, because it can be changed into a prime (65393) 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, 1907 + ... + 1940.

It is an arithmetic number, because the mean of its divisors is an integer number (17316).

2⁶⁵³⁹⁹ is an apocalyptic number.

65399 is a deficient number, since it is larger than the sum of its proper divisors (3865).

65399 is a wasteful number, since it uses less digits than its factorization.

65399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3864.

The product of its digits is 7290, while the sum is 32.

The square root of 65399 is about 255.7322818887. The cubic root of 65399 is about 40.2893600548.

It can be divided in two parts, 65 and 399, that added together give a palindrome (464).

The spelling of 65399 in words is "sixty-five thousand, three hundred ninety-nine".