138819218 has 8 divisors (see below), whose sum is σ = 208797312. Its totient is φ = 69220116.

The previous prime is 138819211. The next prime is 138819253. The reversal of 138819218 is 812918831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×138819218² = 38541550572263048, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138819211) by changing a digit.

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, 93830 + ... + 95297.

It is an arithmetic number, because the mean of its divisors is an integer number (26099664).

Almost surely, 2^138819218 is an apocalyptic number.

138819218 is a deficient number, since it is larger than the sum of its proper divisors (69978094).

138819218 is a wasteful number, since it uses less digits than its factorization.

138819218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189496.

The product of its digits is 27648, while the sum is 41.

The square root of 138819218 is about 11782.1567635132. The cubic root of 138819218 is about 517.7854763820.

The spelling of 138819218 in words is "one hundred thirty-eight million, eight hundred nineteen thousand, two hundred eighteen".