4391128 has 32 divisors (see below), whose sum is σ = 9907200. Its totient is φ = 1782432.

The previous prime is 4391099. The next prime is 4391131. The reversal of 4391128 is 8211934.

It is a happy number.

It is a super-2 number, since 2×4391128² = 38564010224768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 4391096 and 4391105.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1000 + ... + 3127.

It is an arithmetic number, because the mean of its divisors is an integer number (309600).

Almost surely, 2^4391128 is an apocalyptic number.

It is an amenable number.

4391128 is an abundant number, since it is smaller than the sum of its proper divisors (5516072).

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

4391128 is a wasteful number, since it uses less digits than its factorization.

4391128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4159 (or 4155 counting only the distinct ones).

The product of its digits is 1728, while the sum is 28.

The square root of 4391128 is about 2095.5018491999. The cubic root of 4391128 is about 163.7540433708.

The spelling of 4391128 in words is "four million, three hundred ninety-one thousand, one hundred twenty-eight".