138489 has 16 divisors (see below), whose sum is σ = 205632. Its totient is φ = 82368.

The previous prime is 138469. The next prime is 138493. The reversal of 138489 is 984831.

It is not a de Polignac number, because 138489 - 2¹⁶ = 72953 is a prime.

138489 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (138449) 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, 2034 + ... + 2100.

It is an arithmetic number, because the mean of its divisors is an integer number (12852).

2¹³⁸⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

138489 is a deficient number, since it is larger than the sum of its proper divisors (67143).

138489 is a wasteful number, since it uses less digits than its factorization.

138489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136.

The product of its digits is 6912, while the sum is 33.

The square root of 138489 is about 372.1411022717. The cubic root of 138489 is about 51.7374587454.

The spelling of 138489 in words is "one hundred thirty-eight thousand, four hundred eighty-nine".