566399 has 4 divisors (see below), whose sum is σ = 585960. Its totient is φ = 546840.

The previous prime is 566393. The next prime is 566413. The reversal of 566399 is 993665.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993665 = 5 ⋅198733.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-566399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (566393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9737 + ... + 9794.

It is an arithmetic number, because the mean of its divisors is an integer number (146490).

2⁵⁶⁶³⁹⁹ is an apocalyptic number.

566399 is a deficient number, since it is larger than the sum of its proper divisors (19561).

566399 is a wasteful number, since it uses less digits than its factorization.

566399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19560.

The product of its digits is 43740, while the sum is 38.

The square root of 566399 is about 752.5948445213. The cubic root of 566399 is about 82.7384713298.

The spelling of 566399 in words is "five hundred sixty-six thousand, three hundred ninety-nine".