13784649 has 4 divisors (see below), whose sum is σ = 18379536. Its totient is φ = 9189764.

The previous prime is 13784629. The next prime is 13784653. The reversal of 13784649 is 94648731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13784649 - 2⁹ = 13784137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13784649.

It is not an unprimeable number, because it can be changed into a prime (13784629) 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 3 ways as a sum of consecutive naturals, for example, 2297439 + ... + 2297444.

It is an arithmetic number, because the mean of its divisors is an integer number (4594884).

Almost surely, 2^13784649 is an apocalyptic number.

It is an amenable number.

13784649 is a deficient number, since it is larger than the sum of its proper divisors (4594887).

13784649 is an equidigital number, since it uses as much as digits as its factorization.

13784649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4594886.

The product of its digits is 145152, while the sum is 42.

The square root of 13784649 is about 3712.7683741381. The cubic root of 13784649 is about 239.7720578841.

The spelling of 13784649 in words is "thirteen million, seven hundred eighty-four thousand, six hundred forty-nine".