13821244 has 12 divisors (see below), whose sum is σ = 24427368. Its totient is φ = 6842000.

The previous prime is 13821233. The next prime is 13821251. The reversal of 13821244 is 44212831.

It is a congruent number.

It is an unprimeable number.

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, 16702 + ... + 17509.

It is an arithmetic number, because the mean of its divisors is an integer number (2035614).

Almost surely, 2^13821244 is an apocalyptic number.

It is an amenable number.

13821244 is a deficient number, since it is larger than the sum of its proper divisors (10606124).

13821244 is a wasteful number, since it uses less digits than its factorization.

13821244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34316 (or 34314 counting only the distinct ones).

The product of its digits is 1536, while the sum is 25.

The square root of 13821244 is about 3717.6933708955. The cubic root of 13821244 is about 239.9840498659.

It can be divided in two parts, 138212 and 44, that multiplied together give a triangular number (6081328 = T₃₄₈₇).

The spelling of 13821244 in words is "thirteen million, eight hundred twenty-one thousand, two hundred forty-four".