13785644 has 12 divisors (see below), whose sum is σ = 24465168. Its totient is φ = 6795600.

The previous prime is 13785641. The next prime is 13785649. The reversal of 13785644 is 44658731.

It is a junction number, because it is equal to n+sod(n) for n = 13785598 and 13785607.

It is not an unprimeable number, because it can be changed into a prime (13785641) 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, 23987 + ... + 24554.

It is an arithmetic number, because the mean of its divisors is an integer number (2038764).

Almost surely, 2^13785644 is an apocalyptic number.

It is an amenable number.

13785644 is a deficient number, since it is larger than the sum of its proper divisors (10679524).

13785644 is a wasteful number, since it uses less digits than its factorization.

13785644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48616 (or 48614 counting only the distinct ones).

The product of its digits is 80640, while the sum is 38.

The square root of 13785644 is about 3712.9023687676. The cubic root of 13785644 is about 239.7778268003. Note that the first 3 decimals are identical.

The spelling of 13785644 in words is "thirteen million, seven hundred eighty-five thousand, six hundred forty-four".