561040 has 20 divisors (see below), whose sum is σ = 1304604. Its totient is φ = 224384.

The previous prime is 561019. The next prime is 561047. The reversal of 561040 is 40165.

It can be written as a sum of positive squares in 2 ways, for example, as 345744 + 215296 = 588^2 + 464^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (561047) by changing a digit.

561040 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, 3427 + ... + 3586.

2⁵⁶¹⁰⁴⁰ is an apocalyptic number.

It is an amenable number.

561040 is an abundant number, since it is smaller than the sum of its proper divisors (743564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561040 is a wasteful number, since it uses less digits than its factorization.

561040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7026 (or 7020 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 561040 is about 749.0260342605. The cubic root of 561040 is about 82.4766998786.

The spelling of 561040 in words is "five hundred sixty-one thousand, forty".