5638809 has 8 divisors (see below), whose sum is σ = 8201952. Its totient is φ = 3417440.

The previous prime is 5638799. The next prime is 5638811. The reversal of 5638809 is 9088365.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5638809 - 2⁵ = 5638777 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5638859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85404 + ... + 85469.

It is an arithmetic number, because the mean of its divisors is an integer number (1025244).

Almost surely, 2^5638809 is an apocalyptic number.

It is an amenable number.

5638809 is a deficient number, since it is larger than the sum of its proper divisors (2563143).

5638809 is a wasteful number, since it uses less digits than its factorization.

5638809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170887.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 5638809 is about 2374.6176534339. The cubic root of 5638809 is about 177.9900785616.

The spelling of 5638809 in words is "five million, six hundred thirty-eight thousand, eight hundred nine".