12281836 has 12 divisors (see below), whose sum is σ = 24563728. Its totient is φ = 5263632.

The previous prime is 12281831. The next prime is 12281881. The reversal of 12281836 is 63818221.

12281836 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 12281798 and 12281807.

It is not an unprimeable number, because it can be changed into a prime (12281831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219291 + ... + 219346.

Almost surely, 2^12281836 is an apocalyptic number.

It is an amenable number.

12281836 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

12281836 is a wasteful number, since it uses less digits than its factorization.

12281836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438648 (or 438646 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 12281836 is about 3504.5450489329. The cubic root of 12281836 is about 230.7213396118.

The spelling of 12281836 in words is "twelve million, two hundred eighty-one thousand, eight hundred thirty-six".