4398021 has 12 divisors (see below), whose sum is σ = 6413472. Its totient is φ = 2903976.

The previous prime is 4398013. The next prime is 4398047. The reversal of 4398021 is 1208934.

It is not a de Polignac number, because 4398021 - 2³ = 4398013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4398011) 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, 1321 + ... + 3246.

It is an arithmetic number, because the mean of its divisors is an integer number (534456).

Almost surely, 2^4398021 is an apocalyptic number.

It is an amenable number.

4398021 is a deficient number, since it is larger than the sum of its proper divisors (2015451).

4398021 is a wasteful number, since it uses less digits than its factorization.

4398021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4680 (or 4677 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 4398021 is about 2097.1459176700. The cubic root of 4398021 is about 163.8396832118.

The spelling of 4398021 in words is "four million, three hundred ninety-eight thousand, twenty-one".