4390809 has 12 divisors (see below), whose sum is σ = 6053328. Its totient is φ = 2830920.

The previous prime is 4390801. The next prime is 4390817. The reversal of 4390809 is 9080934.

It is an interprime number because it is at equal distance from previous prime (4390801) and next prime (4390817).

It is not a de Polignac number, because 4390809 - 2³ = 4390801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4390809.

It is not an unprimeable number, because it can be changed into a prime (4390801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2122 + ... + 3644.

It is an arithmetic number, because the mean of its divisors is an integer number (504444).

Almost surely, 2^4390809 is an apocalyptic number.

It is an amenable number.

4390809 is a deficient number, since it is larger than the sum of its proper divisors (1662519).

4390809 is a wasteful number, since it uses less digits than its factorization.

4390809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588 (or 1557 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 4390809 is about 2095.4257323990. The cubic root of 4390809 is about 163.7500778898.

The spelling of 4390809 in words is "four million, three hundred ninety thousand, eight hundred nine".