138617859 has 4 divisors (see below), whose sum is σ = 184823816. Its totient is φ = 92411904.

The previous prime is 138617839. The next prime is 138617861. The reversal of 138617859 is 958716831.

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

It is not a de Polignac number, because 138617859 - 2⁵ = 138617827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138617819) 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, 23102974 + ... + 23102979.

It is an arithmetic number, because the mean of its divisors is an integer number (46205954).

Almost surely, 2^138617859 is an apocalyptic number.

138617859 is a deficient number, since it is larger than the sum of its proper divisors (46205957).

138617859 is an equidigital number, since it uses as much as digits as its factorization.

138617859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46205956.

The product of its digits is 362880, while the sum is 48.

The square root of 138617859 is about 11773.6085802102. The cubic root of 138617859 is about 517.5350038168.

The spelling of 138617859 in words is "one hundred thirty-eight million, six hundred seventeen thousand, eight hundred fifty-nine".