4209889 has 2 divisors, whose sum is σ = 4209890. Its totient is φ = 4209888.

The previous prime is 4209883. The next prime is 4209899. The reversal of 4209889 is 9889024.

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., 2689600 + 1520289 = 1640^2 + 1233^2 .

It is a cyclic number.

It is not a de Polignac number, because 4209889 - 2¹⁷ = 4078817 is a prime.

It is not a weakly prime, because it can be changed into another prime (4209883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2104944 + 2104945.

It is an arithmetic number, because the mean of its divisors is an integer number (2104945).

Almost surely, 2^4209889 is an apocalyptic number.

It is an amenable number.

4209889 is a deficient number, since it is larger than the sum of its proper divisors (1).

4209889 is an equidigital number, since it uses as much as digits as its factorization.

4209889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 4209889 is about 2051.8014036451. The cubic root of 4209889 is about 161.4693938877.

The spelling of 4209889 in words is "four million, two hundred nine thousand, eight hundred eighty-nine".