5638865 has 4 divisors (see below), whose sum is σ = 6766644. Its totient is φ = 4511088.

The previous prime is 5638859. The next prime is 5638873. The reversal of 5638865 is 5688365.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5688365 = 5 ⋅1137673.

It can be written as a sum of positive squares in 2 ways, for example, as 2666689 + 2972176 = 1633^2 + 1724^2 .

It is a cyclic number.

It is not a de Polignac number, because 5638865 - 2¹⁴ = 5622481 is a prime.

It is a d-powerful number, because it can be written as 5⁹ + 6² + 3⁹ + 8³ + 8⁵ + 6⁸ + 5⁹ .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 563882 + ... + 563891.

It is an arithmetic number, because the mean of its divisors is an integer number (1691661).

Almost surely, 2^5638865 is an apocalyptic number.

It is an amenable number.

5638865 is a deficient number, since it is larger than the sum of its proper divisors (1127779).

5638865 is a wasteful number, since it uses less digits than its factorization.

5638865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127778.

The product of its digits is 172800, while the sum is 41.

The square root of 5638865 is about 2374.6294447766. The cubic root of 5638865 is about 177.9906677765.

The spelling of 5638865 in words is "five million, six hundred thirty-eight thousand, eight hundred sixty-five".