12005811 has 12 divisors (see below), whose sum is σ = 17386200. Its totient is φ = 7983360.

The previous prime is 12005801. The next prime is 12005813. The reversal of 12005811 is 11850021.

It is not a de Polignac number, because 12005811 - 2⁵ = 12005779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12005813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2556 + ... + 5526.

It is an arithmetic number, because the mean of its divisors is an integer number (1448850).

Almost surely, 2^12005811 is an apocalyptic number.

12005811 is a deficient number, since it is larger than the sum of its proper divisors (5380389).

12005811 is a wasteful number, since it uses less digits than its factorization.

12005811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3426 (or 3423 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 12005811 is about 3464.9402592253. The cubic root of 12005811 is about 228.9797977386.

Adding to 12005811 its reverse (11850021), we get a palindrome (23855832).

The spelling of 12005811 in words is "twelve million, five thousand, eight hundred eleven".