4423639 has 6 divisors (see below), whose sum is σ = 4862480. Its totient is φ = 4021380.

The previous prime is 4423619. The next prime is 4423649. The reversal of 4423639 is 9363244.

It is not a de Polignac number, because 4423639 - 2⁷ = 4423511 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4423639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4423619) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18159 + ... + 18400.

Almost surely, 2^4423639 is an apocalyptic number.

4423639 is a deficient number, since it is larger than the sum of its proper divisors (438841).

4423639 is a wasteful number, since it uses less digits than its factorization.

4423639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36581 (or 36570 counting only the distinct ones).

The product of its digits is 15552, while the sum is 31.

The square root of 4423639 is about 2103.2448739983. The cubic root of 4423639 is about 164.1571837251.

The spelling of 4423639 in words is "four million, four hundred twenty-three thousand, six hundred thirty-nine".