561203440 has 40 divisors (see below), whose sum is σ = 1491199200. Its totient is φ = 192412416.

The previous prime is 561203417. The next prime is 561203441. The reversal of 561203440 is 44302165.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561203441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500515 + ... + 501634.

It is an arithmetic number, because the mean of its divisors is an integer number (37279980).

Almost surely, 2^561203440 is an apocalyptic number.

It is an amenable number.

561203440 is an abundant number, since it is smaller than the sum of its proper divisors (929995760).

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

561203440 is a wasteful number, since it uses less digits than its factorization.

561203440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002169 (or 1002163 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 561203440 is about 23689.7327971423. The cubic root of 561203440 is about 824.8470803194.

The spelling of 561203440 in words is "five hundred sixty-one million, two hundred three thousand, four hundred forty".