13821424 has 30 divisors (see below), whose sum is σ = 27565944. Its totient is φ = 6713280.

The previous prime is 13821407. The next prime is 13821427. The reversal of 13821424 is 42412831.

It is a super-2 number, since 2×13821424² = 382063522775552, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13821427) 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 5 ways as a sum of consecutive naturals, for example, 21589 + ... + 22219.

Almost surely, 2^13821424 is an apocalyptic number.

It is an amenable number.

13821424 is a deficient number, since it is larger than the sum of its proper divisors (13744520).

13821424 is an equidigital number, since it uses as much as digits as its factorization.

13821424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713 (or 670 counting only the distinct ones).

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

The square root of 13821424 is about 3717.7175793758. The cubic root of 13821424 is about 239.9850916665.

The spelling of 13821424 in words is "thirteen million, eight hundred twenty-one thousand, four hundred twenty-four".