138000859 has 4 divisors (see below), whose sum is σ = 138398904. Its totient is φ = 137602816.

The previous prime is 138000847. The next prime is 138000887. The reversal of 138000859 is 958000831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 958000831 = 761 ⋅1258871.

It is a cyclic number.

It is not a de Polignac number, because 138000859 - 2⁵ = 138000827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138000829) 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, 198502 + ... + 199195.

It is an arithmetic number, because the mean of its divisors is an integer number (34599726).

Almost surely, 2^138000859 is an apocalyptic number.

138000859 is a deficient number, since it is larger than the sum of its proper divisors (398045).

138000859 is an equidigital number, since it uses as much as digits as its factorization.

138000859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398044.

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

The square root of 138000859 is about 11747.3766858818. The cubic root of 138000859 is about 516.7659974589.

The spelling of 138000859 in words is "one hundred thirty-eight million, eight hundred fifty-nine", and thus it is an aban number.