65939 has 4 divisors (see below), whose sum is σ = 66456. Its totient is φ = 65424.

The previous prime is 65929. The next prime is 65951. The reversal of 65939 is 93956.

Added to its reverse (93956) it gives a triangular number (159895 = T₅₆₅).

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 65939 - 2¹² = 61843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65929) 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, 92 + ... + 374.

It is an arithmetic number, because the mean of its divisors is an integer number (16614).

2⁶⁵⁹³⁹ is an apocalyptic number.

65939 is a deficient number, since it is larger than the sum of its proper divisors (517).

65939 is a wasteful number, since it uses less digits than its factorization.

65939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516.

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

The square root of 65939 is about 256.7859030399. The cubic root of 65939 is about 40.3999460836.

Adding to 65939 its reverse (93956), we get a triangular number (159895 = T₅₆₅).

The spelling of 65939 in words is "sixty-five thousand, nine hundred thirty-nine".