12489228 has 42 divisors (see below), whose sum is σ = 32776884. Its totient is φ = 4162104.

The previous prime is 12489167. The next prime is 12489229. The reversal of 12489228 is 82298421.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 12489192 and 12489201.

It is not an unprimeable number, because it can be changed into a prime (12489229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 775 + ... + 5057.

It is an arithmetic number, because the mean of its divisors is an integer number (780402).

Almost surely, 2^12489228 is an apocalyptic number.

12489228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12489228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16388442).

12489228 is an abundant number, since it is smaller than the sum of its proper divisors (20287656).

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

12489228 is an equidigital number, since it uses as much as digits as its factorization.

12489228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4305 (or 4288 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 12489228 is about 3534.0101867425. The cubic root of 12489228 is about 232.0127569283.

The spelling of 12489228 in words is "twelve million, four hundred eighty-nine thousand, two hundred twenty-eight".