13643841 has 4 divisors (see below), whose sum is σ = 18191792. Its totient is φ = 9095892.

The previous prime is 13643837. The next prime is 13643863. The reversal of 13643841 is 14834631.

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 not a de Polignac number, because 13643841 - 2² = 13643837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13643799 and 13643808.

It is not an unprimeable number, because it can be changed into a prime (13643801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2273971 + ... + 2273976.

It is an arithmetic number, because the mean of its divisors is an integer number (4547948).

Almost surely, 2^13643841 is an apocalyptic number.

It is an amenable number.

13643841 is a deficient number, since it is larger than the sum of its proper divisors (4547951).

13643841 is an equidigital number, since it uses as much as digits as its factorization.

13643841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4547950.

The product of its digits is 6912, while the sum is 30.

The square root of 13643841 is about 3693.7570304502. The cubic root of 13643841 is about 238.9528510016.

The spelling of 13643841 in words is "thirteen million, six hundred forty-three thousand, eight hundred forty-one".