13666749 has 4 divisors (see below), whose sum is σ = 18222336. Its totient is φ = 9111164.

The previous prime is 13666729. The next prime is 13666769. The reversal of 13666749 is 94766631.

13666749 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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 an interprime number because it is at equal distance from previous prime (13666729) and next prime (13666769).

It is a cyclic number.

It is not a de Polignac number, because 13666749 - 2⁵ = 13666717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13666749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13666729) 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, 2277789 + ... + 2277794.

It is an arithmetic number, because the mean of its divisors is an integer number (4555584).

Almost surely, 2^13666749 is an apocalyptic number.

It is an amenable number.

13666749 is a deficient number, since it is larger than the sum of its proper divisors (4555587).

13666749 is an equidigital number, since it uses as much as digits as its factorization.

13666749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4555586.

The product of its digits is 163296, while the sum is 42.

The square root of 13666749 is about 3696.8566377397. The cubic root of 13666749 is about 239.0865101178.

The spelling of 13666749 in words is "thirteen million, six hundred sixty-six thousand, seven hundred forty-nine".