138216877 has 4 divisors (see below), whose sum is σ = 138258016. Its totient is φ = 138175740.

The previous prime is 138216853. The next prime is 138216889. The reversal of 138216877 is 778612831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138216877 - 2¹⁹ = 137692589 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 (138216277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15033 + ... + 22414.

It is an arithmetic number, because the mean of its divisors is an integer number (34564504).

Almost surely, 2^138216877 is an apocalyptic number.

It is an amenable number.

138216877 is a deficient number, since it is larger than the sum of its proper divisors (41139).

138216877 is an equidigital number, since it uses as much as digits as its factorization.

138216877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41138.

The product of its digits is 112896, while the sum is 43.

The square root of 138216877 is about 11756.5673986925. The cubic root of 138216877 is about 517.0354947216.

The spelling of 138216877 in words is "one hundred thirty-eight million, two hundred sixteen thousand, eight hundred seventy-seven".