138968 has 16 divisors (see below), whose sum is σ = 270000. Its totient is φ = 66976.

The previous prime is 138967. The next prime is 138977. The reversal of 138968 is 869831.

138968 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138967) 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, 68 + ... + 531.

It is an arithmetic number, because the mean of its divisors is an integer number (16875).

2¹³⁸⁹⁶⁸ is an apocalyptic number.

It is an amenable number.

138968 is a deficient number, since it is larger than the sum of its proper divisors (131032).

138968 is a wasteful number, since it uses less digits than its factorization.

138968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634 (or 630 counting only the distinct ones).

The product of its digits is 10368, while the sum is 35.

The square root of 138968 is about 372.7841198334. The cubic root of 138968 is about 51.7970392309.

The spelling of 138968 in words is "one hundred thirty-eight thousand, nine hundred sixty-eight".