11421728 has 12 divisors (see below), whose sum is σ = 22486590. Its totient is φ = 5710848.

The previous prime is 11421721. The next prime is 11421749. The reversal of 11421728 is 82712411.

It can be written as a sum of positive squares in only one way, i.e., 10942864 + 478864 = 3308^2 + 692^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11421697 and 11421706.

It is not an unprimeable number, because it can be changed into a prime (11421721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 178433 + ... + 178496.

Almost surely, 2^11421728 is an apocalyptic number.

It is an amenable number.

11421728 is a deficient number, since it is larger than the sum of its proper divisors (11064862).

11421728 is an equidigital number, since it uses as much as digits as its factorization.

11421728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356939 (or 356931 counting only the distinct ones).

The product of its digits is 896, while the sum is 26.

The square root of 11421728 is about 3379.6047106134. The cubic root of 11421728 is about 225.2046072964.

The spelling of 11421728 in words is "eleven million, four hundred twenty-one thousand, seven hundred twenty-eight".