138985 has 24 divisors (see below), whose sum is σ = 219456. Its totient is φ = 82080.

The previous prime is 138977. The next prime is 139021. The reversal of 138985 is 589831.

It is not a de Polignac number, because 138985 - 2³ = 138977 is a prime.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138985.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7306 + ... + 7324.

It is an arithmetic number, because the mean of its divisors is an integer number (9144).

2¹³⁸⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

138985 is a deficient number, since it is larger than the sum of its proper divisors (80471).

138985 is a wasteful number, since it uses less digits than its factorization.

138985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61 (or 42 counting only the distinct ones).

The product of its digits is 8640, while the sum is 34.

The square root of 138985 is about 372.8069205366. The cubic root of 138985 is about 51.7991512609.

It can be divided in two parts, 13 and 8985, that added together give a palindrome (8998).

The spelling of 138985 in words is "one hundred thirty-eight thousand, nine hundred eighty-five".