11509428 has 48 divisors (see below), whose sum is σ = 30902144. Its totient is φ = 3265920.

The previous prime is 11509403. The next prime is 11509429. The reversal of 11509428 is 82490511.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 11509395 and 11509404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11509429) 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, 14826 + ... + 15582.

Almost surely, 2^11509428 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 11509428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15451072).

11509428 is an abundant number, since it is smaller than the sum of its proper divisors (19392716).

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

11509428 is a wasteful number, since it uses less digits than its factorization.

11509428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952 (or 950 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 11509428 is about 3392.5547895355. The cubic root of 11509428 is about 225.7795380581.

Adding to 11509428 its reverse (82490511), we get a palindrome (93999939).

The spelling of 11509428 in words is "eleven million, five hundred nine thousand, four hundred twenty-eight".