13781116 has 12 divisors (see below), whose sum is σ = 24388560. Its totient is φ = 6812960.

The previous prime is 13781107. The next prime is 13781123. The reversal of 13781116 is 61118731.

It is a congruent number.

It is an unprimeable number.

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, 19000 + ... + 19711.

It is an arithmetic number, because the mean of its divisors is an integer number (2032380).

Almost surely, 2^13781116 is an apocalyptic number.

It is an amenable number.

13781116 is a deficient number, since it is larger than the sum of its proper divisors (10607444).

13781116 is a wasteful number, since it uses less digits than its factorization.

13781116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38804 (or 38802 counting only the distinct ones).

The product of its digits is 1008, while the sum is 28.

The square root of 13781116 is about 3712.2925531267. The cubic root of 13781116 is about 239.7515716397.

Adding to 13781116 its reverse (61118731), we get a palindrome (74899847).

The spelling of 13781116 in words is "thirteen million, seven hundred eighty-one thousand, one hundred sixteen".