65439 has 12 divisors (see below), whose sum is σ = 103272. Its totient is φ = 39600.

The previous prime is 65437. The next prime is 65447. The reversal of 65439 is 93456.

It is a happy number.

65439 is a `hidden beast` number, since 654 + 3 + 9 = 666.

It is not a de Polignac number, because 65439 - 2¹ = 65437 is a prime.

65439 is a lucky number.

It is a zygodrome in base 2.

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 65439.

It is not an unprimeable number, because it can be changed into a prime (65437) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 232 + ... + 429.

It is an arithmetic number, because the mean of its divisors is an integer number (8606).

2⁶⁵⁴³⁹ is an apocalyptic number.

65439 is a deficient number, since it is larger than the sum of its proper divisors (37833).

65439 is a wasteful number, since it uses less digits than its factorization.

65439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678 (or 675 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 65439 is about 255.8104767206. The cubic root of 65439 is about 40.2975724431.

It can be divided in two parts, 6 and 5439, that added together give a palindrome (5445).

The spelling of 65439 in words is "sixty-five thousand, four hundred thirty-nine".