13821906 has 32 divisors (see below), whose sum is σ = 31776768. Its totient is φ = 3926160.

The previous prime is 13821889. The next prime is 13821931. The reversal of 13821906 is 60912831.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7161 + ... + 8883.

It is an arithmetic number, because the mean of its divisors is an integer number (993024).

Almost surely, 2^13821906 is an apocalyptic number.

13821906 is an abundant number, since it is smaller than the sum of its proper divisors (17954862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13821906 is a wasteful number, since it uses less digits than its factorization.

13821906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1926.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 13821906 is about 3717.7824035304. The cubic root of 13821906 is about 239.9878813325.

The spelling of 13821906 in words is "thirteen million, eight hundred twenty-one thousand, nine hundred six".