138855 has 8 divisors (see below), whose sum is σ = 222192. Its totient is φ = 74048.

The previous prime is 138841. The next prime is 138863. The reversal of 138855 is 558831.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138855 - 2⁷ = 138727 is a prime.

It is a super-2 number, since 2×138855² = 38561422050, which contains 22 as substring.

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 138855.

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, 4614 + ... + 4643.

It is an arithmetic number, because the mean of its divisors is an integer number (27774).

2¹³⁸⁸⁵⁵ is an apocalyptic number.

138855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138855 is a deficient number, since it is larger than the sum of its proper divisors (83337).

138855 is an equidigital number, since it uses as much as digits as its factorization.

138855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9265.

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

The square root of 138855 is about 372.6325267606. The cubic root of 138855 is about 51.7829960637.

The spelling of 138855 in words is "one hundred thirty-eight thousand, eight hundred fifty-five".