138255 has 16 divisors (see below), whose sum is σ = 238560. Its totient is φ = 67968.

The previous prime is 138251. The next prime is 138283. The reversal of 138255 is 552831.

It is not a de Polignac number, because 138255 - 2² = 138251 is a prime.

It is a super-2 number, since 2×138255² = 38228890050, which contains 22 as substring.

138255 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160 + ... + 549.

It is an arithmetic number, because the mean of its divisors is an integer number (14910).

2¹³⁸²⁵⁵ is an apocalyptic number.

138255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138255 is a deficient number, since it is larger than the sum of its proper divisors (100305).

138255 is a wasteful number, since it uses less digits than its factorization.

138255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730.

The product of its digits is 1200, while the sum is 24.

The square root of 138255 is about 371.8265724770. The cubic root of 138255 is about 51.7083026621.

It can be divided in two parts, 138 and 255, that added together give a palindrome (393).

The spelling of 138255 in words is "one hundred thirty-eight thousand, two hundred fifty-five".