13681636 has 6 divisors (see below), whose sum is σ = 23942870. Its totient is φ = 6840816.

The previous prime is 13681621. The next prime is 13681639. The reversal of 13681636 is 63618631.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13616100 + 65536 = 3690^2 + 256^2 .

It is not an unprimeable number, because it can be changed into a prime (13681639) 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 as a sum of consecutive naturals, namely, 1710201 + ... + 1710208.

Almost surely, 2^13681636 is an apocalyptic number.

It is an amenable number.

13681636 is a deficient number, since it is larger than the sum of its proper divisors (10261234).

13681636 is a wasteful number, since it uses less digits than its factorization.

13681636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3420413 (or 3420411 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 13681636 is about 3698.8695570404. The cubic root of 13681636 is about 239.1732898219.

The spelling of 13681636 in words is "thirteen million, six hundred eighty-one thousand, six hundred thirty-six".