4382021 has 12 divisors (see below), whose sum is σ = 5237388. Its totient is φ = 3652992.

The previous prime is 4382003. The next prime is 4382023. The reversal of 4382021 is 1202834.

It can be written as a sum of positive squares in 2 ways, for example, as 4120900 + 261121 = 2030^2 + 511^2 .

It is a de Polignac number, because none of the positive numbers 2^k-4382021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4381984 and 4382002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4382023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 605 + ... + 3021.

It is an arithmetic number, because the mean of its divisors is an integer number (436449).

Almost surely, 2^4382021 is an apocalyptic number.

It is an amenable number.

4382021 is a deficient number, since it is larger than the sum of its proper divisors (855367).

4382021 is a wasteful number, since it uses less digits than its factorization.

4382021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2468 (or 2461 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 4382021 is about 2093.3277335382. The cubic root of 4382021 is about 163.6407588700.

Adding to 4382021 its reverse (1202834), we get a palindrome (5584855).

The spelling of 4382021 in words is "four million, three hundred eighty-two thousand, twenty-one".