4408639 has 2 divisors, whose sum is σ = 4408640. Its totient is φ = 4408638.

The previous prime is 4408637. The next prime is 4408643. The reversal of 4408639 is 9368044.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4408639 - 2¹ = 4408637 is a prime.

Together with 4408637, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4408637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2204319 + 2204320.

It is an arithmetic number, because the mean of its divisors is an integer number (2204320).

Almost surely, 2^4408639 is an apocalyptic number.

4408639 is a deficient number, since it is larger than the sum of its proper divisors (1).

4408639 is an equidigital number, since it uses as much as digits as its factorization.

4408639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 4408639 is about 2099.6759273755. The cubic root of 4408639 is about 163.9714281973.

The spelling of 4408639 in words is "four million, four hundred eight thousand, six hundred thirty-nine".