11989428 has 48 divisors (see below), whose sum is σ = 31039680. Its totient is φ = 3571200.

The previous prime is 11989423. The next prime is 11989451. The reversal of 11989428 is 82498911.

It is a self number, because there is not a number n which added to its sum of digits gives 11989428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11989421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7308 + ... + 8796.

It is an arithmetic number, because the mean of its divisors is an integer number (646660).

Almost surely, 2^11989428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11989428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15519840).

11989428 is an abundant number, since it is smaller than the sum of its proper divisors (19050252).

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

11989428 is a wasteful number, since it uses less digits than its factorization.

11989428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1568 (or 1566 counting only the distinct ones).

The product of its digits is 41472, while the sum is 42.

The square root of 11989428 is about 3462.5753421406. The cubic root of 11989428 is about 228.8755958738.

The spelling of 11989428 in words is "eleven million, nine hundred eighty-nine thousand, four hundred twenty-eight".