138895 has 4 divisors (see below), whose sum is σ = 166680. Its totient is φ = 111112.

The previous prime is 138893. The next prime is 138899. The reversal of 138895 is 598831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 598831 = 149 ⋅4019.

It is a cyclic number.

It is not a de Polignac number, because 138895 - 2¹ = 138893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138895.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138893) 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, 13885 + ... + 13894.

It is an arithmetic number, because the mean of its divisors is an integer number (41670).

2¹³⁸⁸⁹⁵ is an apocalyptic number.

138895 is a deficient number, since it is larger than the sum of its proper divisors (27785).

138895 is an equidigital number, since it uses as much as digits as its factorization.

138895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27784.

The product of its digits is 8640, while the sum is 34.

The square root of 138895 is about 372.6861950757. The cubic root of 138895 is about 51.7879679671.

The spelling of 138895 in words is "one hundred thirty-eight thousand, eight hundred ninety-five".