13821872 has 10 divisors (see below), whose sum is σ = 26779908. Its totient is φ = 6910928.

The previous prime is 13821869. The next prime is 13821881. The reversal of 13821872 is 27812831.

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 as a sum of consecutive naturals, namely, 431918 + ... + 431949.

Almost surely, 2^13821872 is an apocalyptic number.

It is an amenable number.

13821872 is a deficient number, since it is larger than the sum of its proper divisors (12958036).

13821872 is an equidigital number, since it uses as much as digits as its factorization.

13821872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863875 (or 863869 counting only the distinct ones).

The product of its digits is 5376, while the sum is 32.

The square root of 13821872 is about 3717.7778309092. Note that the first 3 decimals coincide. The cubic root of 13821872 is about 239.9876845532.

The spelling of 13821872 in words is "thirteen million, eight hundred twenty-one thousand, eight hundred seventy-two".