13621866 has 8 divisors (see below), whose sum is σ = 27243744. Its totient is φ = 4540620.

The previous prime is 13621831. The next prime is 13621871. The reversal of 13621866 is 66812631.

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

13621866 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1135150 + ... + 1135161.

It is an arithmetic number, because the mean of its divisors is an integer number (3405468).

Almost surely, 2^13621866 is an apocalyptic number.

13621866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

13621866 is a wasteful number, since it uses less digits than its factorization.

13621866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2270316.

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

The square root of 13621866 is about 3690.7812181163. The cubic root of 13621866 is about 238.8244949046.

The spelling of 13621866 in words is "thirteen million, six hundred twenty-one thousand, eight hundred sixty-six".