13721824 has 12 divisors (see below), whose sum is σ = 27014904. Its totient is φ = 6860896.

The previous prime is 13721789. The next prime is 13721833. The reversal of 13721824 is 42812731.

It is a junction number, because it is equal to n+sod(n) for n = 13721792 and 13721801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214372 + ... + 214435.

It is an arithmetic number, because the mean of its divisors is an integer number (2251242).

Almost surely, 2^13721824 is an apocalyptic number.

It is an amenable number.

13721824 is a deficient number, since it is larger than the sum of its proper divisors (13293080).

13721824 is an equidigital number, since it uses as much as digits as its factorization.

13721824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428817 (or 428809 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 13721824 is about 3704.2980441644. The cubic root of 13721824 is about 239.4072408950.

The spelling of 13721824 in words is "thirteen million, seven hundred twenty-one thousand, eight hundred twenty-four".