138219879 has 16 divisors (see below), whose sum is σ = 213508352. Its totient is φ = 77899968.

The previous prime is 138219863. The next prime is 138219899. The reversal of 138219879 is 978912831.

It is not a de Polignac number, because 138219879 - 2⁴ = 138219863 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 (138219899) 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 15 ways as a sum of consecutive naturals, for example, 43549 + ... + 46614.

It is an arithmetic number, because the mean of its divisors is an integer number (13344272).

Almost surely, 2^138219879 is an apocalyptic number.

138219879 is a deficient number, since it is larger than the sum of its proper divisors (75288473).

138219879 is an equidigital number, since it uses as much as digits as its factorization.

138219879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90246.

The product of its digits is 217728, while the sum is 48.

The square root of 138219879 is about 11756.6950713200. The cubic root of 138219879 is about 517.0392379434.

The spelling of 138219879 in words is "one hundred thirty-eight million, two hundred nineteen thousand, eight hundred seventy-nine".