138621183 has 4 divisors (see below), whose sum is σ = 184828248. Its totient is φ = 92414120.

The previous prime is 138621173. The next prime is 138621199. The reversal of 138621183 is 381126831.

138621183 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 138621183 - 2⁴ = 138621167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138621103) 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, 23103528 + ... + 23103533.

It is an arithmetic number, because the mean of its divisors is an integer number (46207062).

Almost surely, 2^138621183 is an apocalyptic number.

138621183 is a deficient number, since it is larger than the sum of its proper divisors (46207065).

138621183 is an equidigital number, since it uses as much as digits as its factorization.

138621183 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46207064.

The product of its digits is 6912, while the sum is 33.

The square root of 138621183 is about 11773.7497425417. The cubic root of 138621183 is about 517.5391405435.

The spelling of 138621183 in words is "one hundred thirty-eight million, six hundred twenty-one thousand, one hundred eighty-three".