138530 has 16 divisors (see below), whose sum is σ = 285120. Its totient is φ = 47472.

The previous prime is 138517. The next prime is 138547. The reversal of 138530 is 35831.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 920 + ... + 1059.

It is an arithmetic number, because the mean of its divisors is an integer number (17820).

2¹³⁸⁵³⁰ is an apocalyptic number.

138530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138530 is an abundant number, since it is smaller than the sum of its proper divisors (146590).

It is a weird number, because it is abundant, but not a pseudoperfect number.

138530 is a wasteful number, since it uses less digits than its factorization.

138530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1993.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 138530 is about 372.1961848273. The cubic root of 138530 is about 51.7425639078.

The spelling of 138530 in words is "one hundred thirty-eight thousand, five hundred thirty".