138455 has 4 divisors (see below), whose sum is σ = 166152. Its totient is φ = 110760.

The previous prime is 138451. The next prime is 138461. The reversal of 138455 is 554831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 554831 = 277 ⋅2003.

It is not a de Polignac number, because 138455 - 2² = 138451 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13841 + ... + 13850.

It is an arithmetic number, because the mean of its divisors is an integer number (41538).

2¹³⁸⁴⁵⁵ is an apocalyptic number.

138455 is a deficient number, since it is larger than the sum of its proper divisors (27697).

138455 is an equidigital number, since it uses as much as digits as its factorization.

138455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27696.

The product of its digits is 2400, while the sum is 26.

The square root of 138455 is about 372.0954178702. The cubic root of 138455 is about 51.7332244318.

The spelling of 138455 in words is "one hundred thirty-eight thousand, four hundred fifty-five".