5218809 has 4 divisors (see below), whose sum is σ = 6958416. Its totient is φ = 3479204.

The previous prime is 5218793. The next prime is 5218817. The reversal of 5218809 is 9088125.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5218809 - 2⁴ = 5218793 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 5218809.

It is not an unprimeable number, because it can be changed into a prime (5218879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 869799 + ... + 869804.

It is an arithmetic number, because the mean of its divisors is an integer number (1739604).

Almost surely, 2^5218809 is an apocalyptic number.

It is an amenable number.

5218809 is a deficient number, since it is larger than the sum of its proper divisors (1739607).

5218809 is a wasteful number, since it uses less digits than its factorization.

5218809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739606.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 5218809 is about 2284.4712736211. The cubic root of 5218809 is about 173.4564555047.

The spelling of 5218809 in words is "five million, two hundred eighteen thousand, eight hundred nine".