13919681 has 8 divisors (see below), whose sum is σ = 14575680. Its totient is φ = 13275472.

The previous prime is 13919663. The next prime is 13919683. The reversal of 13919681 is 18691931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13919681 is a prime.

It is a super-2 number, since 2×13919681² = 387515038283522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13919683) 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 in 7 ways as a sum of consecutive naturals, for example, 485 + ... + 5298.

It is an arithmetic number, because the mean of its divisors is an integer number (1821960).

Almost surely, 2^13919681 is an apocalyptic number.

It is an amenable number.

13919681 is a deficient number, since it is larger than the sum of its proper divisors (655999).

13919681 is an equidigital number, since it uses as much as digits as its factorization.

13919681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5895.

The product of its digits is 11664, while the sum is 38.

The square root of 13919681 is about 3730.9088705033. The cubic root of 13919681 is about 240.5524369045.

The spelling of 13919681 in words is "thirteen million, nine hundred nineteen thousand, six hundred eighty-one".