13666812 has 12 divisors (see below), whose sum is σ = 31889256. Its totient is φ = 4555600.

The previous prime is 13666787. The next prime is 13666813. The reversal of 13666812 is 21866631.

13666812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13666813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 569439 + ... + 569462.

It is an arithmetic number, because the mean of its divisors is an integer number (2657438).

Almost surely, 2^13666812 is an apocalyptic number.

13666812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13666812 is an abundant number, since it is smaller than the sum of its proper divisors (18222444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13666812 is a wasteful number, since it uses less digits than its factorization.

13666812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138908 (or 1138906 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The square root of 13666812 is about 3696.8651584823. The cubic root of 13666812 is about 239.0868774919.

The spelling of 13666812 in words is "thirteen million, six hundred sixty-six thousand, eight hundred twelve".