4189021 has 12 divisors (see below), whose sum is σ = 4609332. Its totient is φ = 3793664.

The previous prime is 4189019. The next prime is 4189027. The reversal of 4189021 is 1209814.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 784996 + 3404025 = 886^2 + 1845^2 .

It is not a de Polignac number, because 4189021 - 2¹ = 4189019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4189027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14151 + ... + 14443.

It is an arithmetic number, because the mean of its divisors is an integer number (384111).

Almost surely, 2^4189021 is an apocalyptic number.

It is an amenable number.

4189021 is a deficient number, since it is larger than the sum of its proper divisors (420311).

4189021 is a wasteful number, since it uses less digits than its factorization.

4189021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368 (or 339 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 4189021 is about 2046.7097986769. The cubic root of 4189021 is about 161.2021559477.

The spelling of 4189021 in words is "four million, one hundred eighty-nine thousand, twenty-one".