13949681 has 4 divisors (see below), whose sum is σ = 13958052. Its totient is φ = 13941312.

The previous prime is 13949671. The next prime is 13949687. The reversal of 13949681 is 18694931.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 9985600 + 3964081 = 3160^2 + 1991^2 .

It is a cyclic number.

It is not a de Polignac number, because 13949681 - 2¹⁰ = 13948657 is a prime.

It is a super-2 number, since 2×13949681² = 389187200003522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13949687) 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, 740 + ... + 5333.

It is an arithmetic number, because the mean of its divisors is an integer number (3489513).

Almost surely, 2^13949681 is an apocalyptic number.

It is an amenable number.

13949681 is a deficient number, since it is larger than the sum of its proper divisors (8371).

13949681 is an equidigital number, since it uses as much as digits as its factorization.

13949681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8370.

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

The square root of 13949681 is about 3734.9271746582. The cubic root of 13949681 is about 240.7251275207.

The spelling of 13949681 in words is "thirteen million, nine hundred forty-nine thousand, six hundred eighty-one".