138555 has 12 divisors (see below), whose sum is σ = 240240. Its totient is φ = 73872.

The previous prime is 138547. The next prime is 138559. The reversal of 138555 is 555831.

It is not a de Polignac number, because 138555 - 2³ = 138547 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 138555.

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 11 ways as a sum of consecutive naturals, for example, 1495 + ... + 1584.

It is an arithmetic number, because the mean of its divisors is an integer number (20020).

2¹³⁸⁵⁵⁵ is an apocalyptic number.

138555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138555 is a deficient number, since it is larger than the sum of its proper divisors (101685).

138555 is a wasteful number, since it uses less digits than its factorization.

138555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3090 (or 3087 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 138555 is about 372.2297677510. The cubic root of 138555 is about 51.7456763173.

The spelling of 138555 in words is "one hundred thirty-eight thousand, five hundred fifty-five".