13784981 has 8 divisors (see below), whose sum is σ = 16439424. Its totient is φ = 11301840.

The previous prime is 13784971. The next prime is 13785001. The reversal of 13784981 is 18948731.

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-13784981 is a prime.

It is a super-2 number, since 2×13784981² = 380051402340722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13784921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42650 + ... + 42971.

It is an arithmetic number, because the mean of its divisors is an integer number (2054928).

Almost surely, 2^13784981 is an apocalyptic number.

It is an amenable number.

13784981 is a deficient number, since it is larger than the sum of its proper divisors (2654443).

13784981 is an equidigital number, since it uses as much as digits as its factorization.

13784981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85651.

The product of its digits is 48384, while the sum is 41.

The square root of 13784981 is about 3712.8130844415. The cubic root of 13784981 is about 239.7739828196.

The spelling of 13784981 in words is "thirteen million, seven hundred eighty-four thousand, nine hundred eighty-one".