138005 has 8 divisors (see below), whose sum is σ = 189312. Its totient is φ = 94608.

The previous prime is 137999. The next prime is 138007. The reversal of 138005 is 500831.

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 138005 - 2⁶ = 137941 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1937 + ... + 2006.

It is an arithmetic number, because the mean of its divisors is an integer number (23664).

2¹³⁸⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

138005 is a deficient number, since it is larger than the sum of its proper divisors (51307).

138005 is an equidigital number, since it uses as much as digits as its factorization.

138005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3955.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 138005 is about 371.4902421330. The cubic root of 138005 is about 51.6771166283.

Adding to 138005 its reverse (500831), we get a palindrome (638836).

The spelling of 138005 in words is "one hundred thirty-eight thousand, five".