12281805 has 24 divisors (see below), whose sum is σ = 21745152. Its totient is φ = 6409824.

The previous prime is 12281767. The next prime is 12281813. The reversal of 12281805 is 50818221.

It is not a de Polignac number, because 12281805 - 2¹² = 12277709 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 789 + ... + 5018.

It is an arithmetic number, because the mean of its divisors is an integer number (906048).

Almost surely, 2^12281805 is an apocalyptic number.

12281805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12281805 is a deficient number, since it is larger than the sum of its proper divisors (9463347).

12281805 is a wasteful number, since it uses less digits than its factorization.

12281805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5865 (or 5862 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 12281805 is about 3504.5406261021. The cubic root of 12281805 is about 230.7211454940.

The spelling of 12281805 in words is "twelve million, two hundred eighty-one thousand, eight hundred five".