11521428 has 12 divisors (see below), whose sum is σ = 26883360. Its totient is φ = 3840472.

The previous prime is 11521421. The next prime is 11521453. The reversal of 11521428 is 82412511.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-4 number, since 4×11521428⁴ (a number of 29 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11521398 and 11521407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11521421) 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, 480048 + ... + 480071.

It is an arithmetic number, because the mean of its divisors is an integer number (2240280).

Almost surely, 2^11521428 is an apocalyptic number.

It is an amenable number.

11521428 is an abundant number, since it is smaller than the sum of its proper divisors (15361932).

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

11521428 is a wasteful number, since it uses less digits than its factorization.

11521428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960126 (or 960124 counting only the distinct ones).

The product of its digits is 640, while the sum is 24.

The square root of 11521428 is about 3394.3229074441. The cubic root of 11521428 is about 225.8579784865.

Adding to 11521428 its reverse (82412511), we get a palindrome (93933939).

The spelling of 11521428 in words is "eleven million, five hundred twenty-one thousand, four hundred twenty-eight".