12005813 has 2 divisors, whose sum is σ = 12005814. Its totient is φ = 12005812.

The previous prime is 12005801. The next prime is 12005827. The reversal of 12005813 is 31850021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11336689 + 669124 = 3367^2 + 818^2 .

It is a cyclic number.

It is not a de Polignac number, because 12005813 - 2¹⁶ = 11940277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12005843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6002906 + 6002907.

It is an arithmetic number, because the mean of its divisors is an integer number (6002907).

Almost surely, 2^12005813 is an apocalyptic number.

It is an amenable number.

12005813 is a deficient number, since it is larger than the sum of its proper divisors (1).

12005813 is an equidigital number, since it uses as much as digits as its factorization.

12005813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 12005813 is about 3464.9405478305. The cubic root of 12005813 is about 228.9798104535.

Adding to 12005813 its reverse (31850021), we get a palindrome (43855834).

The spelling of 12005813 in words is "twelve million, five thousand, eight hundred thirteen".