138333185 has 4 divisors (see below), whose sum is σ = 165999828. Its totient is φ = 110666544.

The previous prime is 138333179. The next prime is 138333197. The reversal of 138333185 is 581333831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 581333831 = 13 ⋅44717987.

It can be written as a sum of positive squares in 2 ways, for example, as 103958416 + 34374769 = 10196^2 + 5863^2 .

It is a cyclic number.

It is not a de Polignac number, because 138333185 - 2²² = 134138881 is a prime.

It is a Duffinian number.

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, 13833314 + ... + 13833323.

It is an arithmetic number, because the mean of its divisors is an integer number (41499957).

Almost surely, 2^138333185 is an apocalyptic number.

It is an amenable number.

138333185 is a deficient number, since it is larger than the sum of its proper divisors (27666643).

138333185 is an equidigital number, since it uses as much as digits as its factorization.

138333185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27666642.

The product of its digits is 25920, while the sum is 35.

The square root of 138333185 is about 11761.5128703751. The cubic root of 138333185 is about 517.1804806445.

The spelling of 138333185 in words is "one hundred thirty-eight million, three hundred thirty-three thousand, one hundred eighty-five".