4389989 has 2 divisors, whose sum is σ = 4389990. Its totient is φ = 4389988.

The previous prime is 4389977. The next prime is 4389997. The reversal of 4389989 is 9899834.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4202500 + 187489 = 2050^2 + 433^2 .

It is a cyclic number.

It is not a de Polignac number, because 4389989 - 2²⁰ = 3341413 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4389919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2194994 + 2194995.

It is an arithmetic number, because the mean of its divisors is an integer number (2194995).

Almost surely, 2^4389989 is an apocalyptic number.

It is an amenable number.

4389989 is a deficient number, since it is larger than the sum of its proper divisors (1).

4389989 is an equidigital number, since it uses as much as digits as its factorization.

4389989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 50.

The square root of 4389989 is about 2095.2300589673. The cubic root of 4389989 is about 163.7398836087.

The spelling of 4389989 in words is "four million, three hundred eighty-nine thousand, nine hundred eighty-nine".