138786130 has 48 divisors (see below), whose sum is σ = 307713816. Its totient is φ = 44782080.

The previous prime is 138786121. The next prime is 138786157. The reversal of 138786130 is 31687831.

138786130 is a nontrivial binomial coefficient, being equal to C(16661, 2).

It can be written as a sum of positive squares in 4 ways, for example, as 124970041 + 13816089 = 11179^2 + 3717^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 138786130.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1 + ... + 16660.

Almost surely, 2^138786130 is an apocalyptic number.

138786130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138786130 is the 16660-th triangular number.

138786130 is the 5554-th centered nonagonal number.

138786130 is an abundant number, since it is smaller than the sum of its proper divisors (168927686).

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

138786130 is a wasteful number, since it uses less digits than its factorization.

138786130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16699 (or 16692 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 138786130 is about 11780.7525226532. The cubic root of 138786130 is about 517.7443345107.

The spelling of 138786130 in words is "one hundred thirty-eight million, seven hundred eighty-six thousand, one hundred thirty".