3147728 has 20 divisors (see below), whose sum is σ = 6156228. Its totient is φ = 1559040.

The previous prime is 3147721. The next prime is 3147751. The reversal of 3147728 is 8277413.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21904 + 3125824 = 148^2 + 1768^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3147694 and 3147703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3147721) 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, 938 + ... + 2678.

Almost surely, 2^3147728 is an apocalyptic number.

It is an amenable number.

3147728 is a deficient number, since it is larger than the sum of its proper divisors (3008500).

3147728 is a wasteful number, since it uses less digits than its factorization.

3147728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1862 (or 1856 counting only the distinct ones).

The product of its digits is 9408, while the sum is 32.

The square root of 3147728 is about 1774.1837559847. The cubic root of 3147728 is about 146.5544688295.

The spelling of 3147728 in words is "three million, one hundred forty-seven thousand, seven hundred twenty-eight".