3821728 has 12 divisors (see below), whose sum is σ = 7524090. Its totient is φ = 1910848.

The previous prime is 3821723. The next prime is 3821729. The reversal of 3821728 is 8271283.

It can be written as a sum of positive squares in only one way, i.e., 3579664 + 242064 = 1892^2 + 492^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3821728.

It is not an unprimeable number, because it can be changed into a prime (3821723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59683 + ... + 59746.

Almost surely, 2^3821728 is an apocalyptic number.

It is an amenable number.

3821728 is a deficient number, since it is larger than the sum of its proper divisors (3702362).

3821728 is a wasteful number, since it uses less digits than its factorization.

3821728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119439 (or 119431 counting only the distinct ones).

The product of its digits is 5376, while the sum is 31.

The square root of 3821728 is about 1954.9240394450. The cubic root of 3821728 is about 156.3459340466.

The spelling of 3821728 in words is "three million, eight hundred twenty-one thousand, seven hundred twenty-eight".