3143728 has 20 divisors (see below), whose sum is σ = 6961360. Its totient is φ = 1347264.

The previous prime is 3143719. The next prime is 3143729. The reversal of 3143728 is 8273413.

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 = 3143696 and 3143705.

It is not an unprimeable number, because it can be changed into a prime (3143729) 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, 13923 + ... + 14146.

It is an arithmetic number, because the mean of its divisors is an integer number (348068).

Almost surely, 2^3143728 is an apocalyptic number.

It is an amenable number.

3143728 is an abundant number, since it is smaller than the sum of its proper divisors (3817632).

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

3143728 is a wasteful number, since it uses less digits than its factorization.

3143728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28084 (or 28078 counting only the distinct ones).

The product of its digits is 4032, while the sum is 28.

The square root of 3143728 is about 1773.0561186832. The cubic root of 3143728 is about 146.4923641025.

The spelling of 3143728 in words is "three million, one hundred forty-three thousand, seven hundred twenty-eight".