4389439 has 2 divisors, whose sum is σ = 4389440. Its totient is φ = 4389438.

The previous prime is 4389403. The next prime is 4389443. The reversal of 4389439 is 9349834.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4389439 - 2¹¹ = 4387391 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4389449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2194719 + 2194720.

It is an arithmetic number, because the mean of its divisors is an integer number (2194720).

Almost surely, 2^4389439 is an apocalyptic number.

4389439 is a deficient number, since it is larger than the sum of its proper divisors (1).

4389439 is an equidigital number, since it uses as much as digits as its factorization.

4389439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 40.

The square root of 4389439 is about 2095.0988043527. The cubic root of 4389439 is about 163.7330452698.

The spelling of 4389439 in words is "four million, three hundred eighty-nine thousand, four hundred thirty-nine".