13686634 has 12 divisors (see below), whose sum is σ = 22231206. Its totient is φ = 6316752.

The previous prime is 13686619. The next prime is 13686641. The reversal of 13686634 is 43668631.

It can be written as a sum of positive squares in 3 ways, for example, as 3783025 + 9903609 = 1945^2 + 3147^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13686593 and 13686602.

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 5 ways as a sum of consecutive naturals, for example, 19909 + ... + 20584.

Almost surely, 2^13686634 is an apocalyptic number.

13686634 is a deficient number, since it is larger than the sum of its proper divisors (8544572).

13686634 is a wasteful number, since it uses less digits than its factorization.

13686634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40521 (or 40508 counting only the distinct ones).

The product of its digits is 62208, while the sum is 37.

The square root of 13686634 is about 3699.5451071720. The cubic root of 13686634 is about 239.2024101837.

It can be divided in two parts, 136866 and 34, that added together give a square (136900 = 370²).

The spelling of 13686634 in words is "thirteen million, six hundred eighty-six thousand, six hundred thirty-four".