138966 has 32 divisors (see below), whose sum is σ = 311040. Its totient is φ = 41184.

The previous prime is 138959. The next prime is 138967. The reversal of 138966 is 669831.

138966 is a Rhonda number in base 9.

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 15 ways as a sum of consecutive naturals, for example, 2596 + ... + 2648.

It is an arithmetic number, because the mean of its divisors is an integer number (9720).

2¹³⁸⁹⁶⁶ is an apocalyptic number.

138966 is an abundant number, since it is smaller than the sum of its proper divisors (172074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138966 is a wasteful number, since it uses less digits than its factorization.

138966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100.

The product of its digits is 7776, while the sum is 33.

The square root of 138966 is about 372.7814373061. The cubic root of 138966 is about 51.7967907455.

The spelling of 138966 in words is "one hundred thirty-eight thousand, nine hundred sixty-six".