561844 has 24 divisors (see below), whose sum is σ = 1064448. Its totient is φ = 258720.

The previous prime is 561839. The next prime is 561907. The reversal of 561844 is 448165.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2754 + ... + 2950.

It is an arithmetic number, because the mean of its divisors is an integer number (44352).

2⁵⁶¹⁸⁴⁴ is an apocalyptic number.

It is an amenable number.

561844 is a deficient number, since it is larger than the sum of its proper divisors (502604).

561844 is a wasteful number, since it uses less digits than its factorization.

561844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 253 counting only the distinct ones).

The product of its digits is 3840, while the sum is 28.

The square root of 561844 is about 749.5625390853. The cubic root of 561844 is about 82.5160788985.

The spelling of 561844 in words is "five hundred sixty-one thousand, eight hundred forty-four".