138558 has 16 divisors (see below), whose sum is σ = 316800. Its totient is φ = 39576.

The previous prime is 138547. The next prime is 138559. The reversal of 138558 is 855831.

It is a happy number.

138558 is nontrivially palindromic in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1608 + ... + 1691.

It is an arithmetic number, because the mean of its divisors is an integer number (19800).

2¹³⁸⁵⁵⁸ is an apocalyptic number.

138558 is an abundant number, since it is smaller than the sum of its proper divisors (178242).

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

138558 is a wasteful number, since it uses less digits than its factorization.

138558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3311.

The product of its digits is 4800, while the sum is 30.

The square root of 138558 is about 372.2337974983. The cubic root of 138558 is about 51.7460497813.

It can be divided in two parts, 138 and 558, that added together give a palindrome (696).

The spelling of 138558 in words is "one hundred thirty-eight thousand, five hundred fifty-eight".