12005806 has 4 divisors (see below), whose sum is σ = 18008712. Its totient is φ = 6002902.

The previous prime is 12005801. The next prime is 12005813. The reversal of 12005806 is 60850021.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12005801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3001450 + ... + 3001453.

It is an arithmetic number, because the mean of its divisors is an integer number (4502178).

Almost surely, 2^12005806 is an apocalyptic number.

12005806 is a deficient number, since it is larger than the sum of its proper divisors (6002906).

12005806 is an equidigital number, since it uses as much as digits as its factorization.

12005806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6002905.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 12005806 is about 3464.9395377120. The cubic root of 12005806 is about 228.9797659512.

Adding to 12005806 its reverse (60850021), we get a palindrome (72855827).

The spelling of 12005806 in words is "twelve million, five thousand, eight hundred six".