561806 has 8 divisors (see below), whose sum is σ = 963120. Its totient is φ = 240768.

The previous prime is 561797. The next prime is 561809. The reversal of 561806 is 608165.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561809) by changing a digit.

561806 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20051 + ... + 20078.

It is an arithmetic number, because the mean of its divisors is an integer number (120390).

2⁵⁶¹⁸⁰⁶ is an apocalyptic number.

561806 is a deficient number, since it is larger than the sum of its proper divisors (401314).

561806 is a wasteful number, since it uses less digits than its factorization.

561806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40138.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 561806 is about 749.5371905383. The cubic root of 561806 is about 82.5142185472.

The spelling of 561806 in words is "five hundred sixty-one thousand, eight hundred six".