13821868 has 24 divisors (see below), whose sum is σ = 25265744. Its totient is φ = 6609600.

The previous prime is 13821853. The next prime is 13821869. The reversal of 13821868 is 86812831.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (13821869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8263 + ... + 9793.

Almost surely, 2^13821868 is an apocalyptic number.

It is an amenable number.

13821868 is a deficient number, since it is larger than the sum of its proper divisors (11443876).

13821868 is a wasteful number, since it uses less digits than its factorization.

13821868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633 (or 1631 counting only the distinct ones).

The product of its digits is 18432, while the sum is 37.

The square root of 13821868 is about 3717.7772929534. Note that the first 3 decimals coincide. The cubic root of 13821868 is about 239.9876614027.

The spelling of 13821868 in words is "thirteen million, eight hundred twenty-one thousand, eight hundred sixty-eight".