13821841 has 4 divisors (see below), whose sum is σ = 15078384. Its totient is φ = 12565300.

The previous prime is 13821839. The next prime is 13821853. The reversal of 13821841 is 14812831.

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 13821841 - 2¹ = 13821839 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13821811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 628255 + ... + 628276.

It is an arithmetic number, because the mean of its divisors is an integer number (3769596).

Almost surely, 2^13821841 is an apocalyptic number.

13821841 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13821841 is a deficient number, since it is larger than the sum of its proper divisors (1256543).

13821841 is a wasteful number, since it uses less digits than its factorization.

13821841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256542.

The product of its digits is 1536, while the sum is 28.

The square root of 13821841 is about 3717.7736617497. The cubic root of 13821841 is about 239.9875051365.

It can be divided in two parts, 1382 and 1841, that added together give a palindrome (3223).

The spelling of 13821841 in words is "thirteen million, eight hundred twenty-one thousand, eight hundred forty-one".