13686740 has 12 divisors (see below), whose sum is σ = 28742196. Its totient is φ = 5474688.

The previous prime is 13686727. The next prime is 13686763. The reversal of 13686740 is 4768631.

It can be written as a sum of positive squares in 2 ways, for example, as 2208196 + 11478544 = 1486^2 + 3388^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 13686740.

It is a congruent number.

It is an unprimeable number.

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, 342149 + ... + 342188.

It is an arithmetic number, because the mean of its divisors is an integer number (2395183).

Almost surely, 2^13686740 is an apocalyptic number.

13686740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13686740 is an abundant number, since it is smaller than the sum of its proper divisors (15055456).

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

13686740 is a wasteful number, since it uses less digits than its factorization.

13686740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684346 (or 684344 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 13686740 is about 3699.5594332299. The cubic root of 13686740 is about 239.2030277056.

The spelling of 13686740 in words is "thirteen million, six hundred eighty-six thousand, seven hundred forty".