4428639 has 12 divisors (see below), whose sum is σ = 6435000. Its totient is φ = 2934864.

The previous prime is 4428607. The next prime is 4428643. The reversal of 4428639 is 9368244.

It is a happy number.

It is not a de Polignac number, because 4428639 - 2⁵ = 4428607 is a prime.

It is a super-2 number, since 2×4428639² = 39225686784642, which contains 22 as substring.

4428639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4428689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 237 + ... + 2985.

It is an arithmetic number, because the mean of its divisors is an integer number (536250).

Almost surely, 2^4428639 is an apocalyptic number.

4428639 is a deficient number, since it is larger than the sum of its proper divisors (2006361).

4428639 is a wasteful number, since it uses less digits than its factorization.

4428639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2934 (or 2931 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 4428639 is about 2104.4331778415. The cubic root of 4428639 is about 164.2190089079.

The spelling of 4428639 in words is "four million, four hundred twenty-eight thousand, six hundred thirty-nine".