4399989 has 16 divisors (see below), whose sum is σ = 6449664. Its totient is φ = 2646000.

The previous prime is 4399987. The next prime is 4400021. The reversal of 4399989 is 9899934.

It is not a de Polignac number, because 4399989 - 2¹ = 4399987 is a prime.

4399989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4399987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4542 + ... + 5424.

It is an arithmetic number, because the mean of its divisors is an integer number (403104).

Almost surely, 2^4399989 is an apocalyptic number.

It is an amenable number.

4399989 is a deficient number, since it is larger than the sum of its proper divisors (2049675).

4399989 is a wasteful number, since it uses less digits than its factorization.

4399989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048.

The product of its digits is 629856, while the sum is 51.

The square root of 4399989 is about 2097.6150743165. The cubic root of 4399989 is about 163.8641175665.

Subtracting 4399989 from its reverse (9899934), we obtain a palindrome (5499945).

It can be divided in two parts, 4 and 399989, that added together give a palindrome (399993).

The spelling of 4399989 in words is "four million, three hundred ninety-nine thousand, nine hundred eighty-nine".