138436183 has 4 divisors (see below), whose sum is σ = 138512200. Its totient is φ = 138360168.

The previous prime is 138436139. The next prime is 138436189. The reversal of 138436183 is 381634831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 381634831 = 31 ⋅12310801.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138436183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138436189) 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, 35208 + ... + 38941.

It is an arithmetic number, because the mean of its divisors is an integer number (34628050).

Almost surely, 2^138436183 is an apocalyptic number.

138436183 is a deficient number, since it is larger than the sum of its proper divisors (76017).

138436183 is an equidigital number, since it uses as much as digits as its factorization.

138436183 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76016.

The product of its digits is 41472, while the sum is 37.

The square root of 138436183 is about 11765.8906590194. The cubic root of 138436183 is about 517.3088069026.

The spelling of 138436183 in words is "one hundred thirty-eight million, four hundred thirty-six thousand, one hundred eighty-three".