138001 has 4 divisors (see below), whose sum is σ = 140400. Its totient is φ = 135604.

The previous prime is 137999. The next prime is 138007. The reversal of 138001 is 100831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 100831 = 59 ⋅1709.

It is a cyclic number.

It is not a de Polignac number, because 138001 - 2¹ = 137999 is a prime.

It is a Duffinian number.

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

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1111 + ... + 1228.

It is an arithmetic number, because the mean of its divisors is an integer number (35100).

2¹³⁸⁰⁰¹ is an apocalyptic number.

It is an amenable number.

138001 is a deficient number, since it is larger than the sum of its proper divisors (2399).

138001 is an equidigital number, since it uses as much as digits as its factorization.

138001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2398.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 138001 is about 371.4848583725. The cubic root of 138001 is about 51.6766173458.

Adding to 138001 its reverse (100831), we get a palindrome (238832).

The spelling of 138001 in words is "one hundred thirty-eight thousand, one".