12289428 has 96 divisors (see below), whose sum is σ = 34473600. Its totient is φ = 3773952.

The previous prime is 12289427. The next prime is 12289441. The reversal of 12289428 is 82498221.

12289428 is a `hidden beast` number, since 1 + 228 + 9 + 428 = 666.

12289428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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 = 12289392 and 12289401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12289427) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108700 + ... + 108812.

It is an arithmetic number, because the mean of its divisors is an integer number (359100).

Almost surely, 2^12289428 is an apocalyptic number.

12289428 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 12289428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17236800).

12289428 is an abundant number, since it is smaller than the sum of its proper divisors (22184172).

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

12289428 is a wasteful number, since it uses less digits than its factorization.

12289428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 190 counting only the distinct ones).

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

The square root of 12289428 is about 3505.6280464419. The cubic root of 12289428 is about 230.7688698456.

The spelling of 12289428 in words is "twelve million, two hundred eighty-nine thousand, four hundred twenty-eight".