13866621 has 8 divisors (see below), whose sum is σ = 18507744. Its totient is φ = 9234960.

The previous prime is 13866617. The next prime is 13866623. The reversal of 13866621 is 12666831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13866621 - 2² = 13866617 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13866623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2470 + ... + 5816.

It is an arithmetic number, because the mean of its divisors is an integer number (2313468).

Almost surely, 2^13866621 is an apocalyptic number.

It is an amenable number.

13866621 is a deficient number, since it is larger than the sum of its proper divisors (4641123).

13866621 is a wasteful number, since it uses less digits than its factorization.

13866621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4731.

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

The square root of 13866621 is about 3723.7912132664. The cubic root of 13866621 is about 240.2463962560.

The spelling of 13866621 in words is "thirteen million, eight hundred sixty-six thousand, six hundred twenty-one".