138819186 has 36 divisors (see below), whose sum is σ = 330609006. Its totient is φ = 42065760.

The previous prime is 138819167. The next prime is 138819203. The reversal of 138819186 is 681918831.

138819186 is a `hidden beast` number, since 1 + 388 + 191 + 86 = 666.

It can be written as a sum of positive squares in only one way, i.e., 138791961 + 27225 = 11781^2 + 165^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 29691 + ... + 34046.

Almost surely, 2^138819186 is an apocalyptic number.

138819186 is an abundant number, since it is smaller than the sum of its proper divisors (191789820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138819186 is a wasteful number, since it uses less digits than its factorization.

138819186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63767 (or 63753 counting only the distinct ones).

The product of its digits is 82944, while the sum is 45.

The square root of 138819186 is about 11782.1554055275. The cubic root of 138819186 is about 517.7854365961.

The spelling of 138819186 in words is "one hundred thirty-eight million, eight hundred nineteen thousand, one hundred eighty-six".