3821428 has 18 divisors (see below), whose sum is σ = 7242774. Its totient is φ = 1763424.

The previous prime is 3821423. The next prime is 3821437. The reversal of 3821428 is 8241283.

It can be written as a sum of positive squares in 3 ways, for example, as 88804 + 3732624 = 298^2 + 1932^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3821396 and 3821405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3821423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2151 + ... + 3502.

Almost surely, 2^3821428 is an apocalyptic number.

It is an amenable number.

3821428 is a deficient number, since it is larger than the sum of its proper divisors (3421346).

3821428 is a wasteful number, since it uses less digits than its factorization.

3821428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5683 (or 5668 counting only the distinct ones).

The product of its digits is 3072, while the sum is 28.

The square root of 3821428 is about 1954.8473086152. The cubic root of 3821428 is about 156.3418429646.

The spelling of 3821428 in words is "three million, eight hundred twenty-one thousand, four hundred twenty-eight".