138544 has 20 divisors (see below), whose sum is σ = 307024. Its totient is φ = 59328.

The previous prime is 138517. The next prime is 138547. The reversal of 138544 is 445831.

It is not an unprimeable number, because it can be changed into a prime (138547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 507 + ... + 730.

2¹³⁸⁵⁴⁴ is an apocalyptic number.

138544 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

138544 is an abundant number, since it is smaller than the sum of its proper divisors (168480).

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

138544 is a wasteful number, since it uses less digits than its factorization.

138544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252 (or 1246 counting only the distinct ones).

The product of its digits is 1920, while the sum is 25.

The square root of 138544 is about 372.2149916379. The cubic root of 138544 is about 51.7443069033.

The spelling of 138544 in words is "one hundred thirty-eight thousand, five hundred forty-four".