138534 has 16 divisors (see below), whose sum is σ = 302400. Its totient is φ = 41960.

The previous prime is 138517. The next prime is 138547. The reversal of 138534 is 435831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 984 + ... + 1115.

It is an arithmetic number, because the mean of its divisors is an integer number (18900).

2¹³⁸⁵³⁴ is an apocalyptic number.

138534 is an abundant number, since it is smaller than the sum of its proper divisors (163866).

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

138534 is a wasteful number, since it uses less digits than its factorization.

138534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2115.

The product of its digits is 1440, while the sum is 24.

The square root of 138534 is about 372.2015582987. The cubic root of 138534 is about 51.7430619185.

The spelling of 138534 in words is "one hundred thirty-eight thousand, five hundred thirty-four".