13691984 has 20 divisors (see below), whose sum is σ = 26766516. Its totient is φ = 6784512.

The previous prime is 13691983. The next prime is 13692037. The reversal of 13691984 is 48919631.

It can be written as a sum of positive squares in 2 ways, for example, as 7441984 + 6250000 = 2728^2 + 2500^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13691981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1979 + ... + 5594.

Almost surely, 2^13691984 is an apocalyptic number.

It is an amenable number.

13691984 is a deficient number, since it is larger than the sum of its proper divisors (13074532).

13691984 is a wasteful number, since it uses less digits than its factorization.

13691984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7694 (or 7688 counting only the distinct ones).

The product of its digits is 46656, while the sum is 41.

The square root of 13691984 is about 3700.2680983950. The cubic root of 13691984 is about 239.2335735845.

The spelling of 13691984 in words is "thirteen million, six hundred ninety-one thousand, nine hundred eighty-four".