13681449 has 12 divisors (see below), whose sum is σ = 19864000. Its totient is φ = 9073944.

The previous prime is 13681433. The next prime is 13681469. The reversal of 13681449 is 94418631.

13681449 is a `hidden beast` number, since 136 + 81 + 449 = 666.

It is not a de Polignac number, because 13681449 - 2⁴ = 13681433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13681429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2029 + ... + 5610.

Almost surely, 2^13681449 is an apocalyptic number.

It is an amenable number.

13681449 is a deficient number, since it is larger than the sum of its proper divisors (6182551).

13681449 is a wasteful number, since it uses less digits than its factorization.

13681449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7844 (or 7841 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 13681449 is about 3698.8442789607. The cubic root of 13681449 is about 239.1722001469.

The spelling of 13681449 in words is "thirteen million, six hundred eighty-one thousand, four hundred forty-nine".