138995 has 4 divisors (see below), whose sum is σ = 166800. Its totient is φ = 111192.

The previous prime is 138977. The next prime is 139021. The reversal of 138995 is 599831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138995 - 2⁸ = 138739 is a prime.

It is a super-2 number, since 2×138995² = 38639220050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13895 + ... + 13904.

It is an arithmetic number, because the mean of its divisors is an integer number (41700).

2¹³⁸⁹⁹⁵ is an apocalyptic number.

138995 is a deficient number, since it is larger than the sum of its proper divisors (27805).

138995 is an equidigital number, since it uses as much as digits as its factorization.

138995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27804.

The product of its digits is 9720, while the sum is 35.

The square root of 138995 is about 372.8203320636. The cubic root of 138995 is about 51.8003935511.

The spelling of 138995 in words is "one hundred thirty-eight thousand, nine hundred ninety-five".