4021189 has 2 divisors, whose sum is σ = 4021190. Its totient is φ = 4021188.

The previous prime is 4021187. The next prime is 4021207. The reversal of 4021189 is 9811204.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3869089 + 152100 = 1967^2 + 390^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021189 - 2¹ = 4021187 is a prime.

Together with 4021187, it forms a pair of twin primes.

4021189 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4021183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010594 + 2010595.

It is an arithmetic number, because the mean of its divisors is an integer number (2010595).

Almost surely, 2^4021189 is an apocalyptic number.

It is an amenable number.

4021189 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021189 is an equidigital number, since it uses as much as digits as its factorization.

4021189 is an evil number, because the sum of its binary digits is even.

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

The square root of 4021189 is about 2005.2902533050. The cubic root of 4021189 is about 159.0199070575.

The spelling of 4021189 in words is "four million, twenty-one thousand, one hundred eighty-nine".