68939 has 4 divisors (see below), whose sum is σ = 74256. Its totient is φ = 63624.

The previous prime is 68927. The next prime is 68947. The reversal of 68939 is 93986.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93986 = 2 ⋅46993.

It is a cyclic number.

It is not a de Polignac number, because 68939 - 2⁸ = 68683 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68899 and 68908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68909) 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, 2639 + ... + 2664.

It is an arithmetic number, because the mean of its divisors is an integer number (18564).

2⁶⁸⁹³⁹ is an apocalyptic number.

68939 is a deficient number, since it is larger than the sum of its proper divisors (5317).

68939 is a wasteful number, since it uses less digits than its factorization.

68939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5316.

The product of its digits is 11664, while the sum is 35.

The square root of 68939 is about 262.5623735420. The cubic root of 68939 is about 41.0035689933.

Subtracting from 68939 its product of digits (11664), we obtain a palindrome (57275).

The spelling of 68939 in words is "sixty-eight thousand, nine hundred thirty-nine".