40561144 has 64 divisors (see below), whose sum is σ = 88381440. Its totient is φ = 17297280.

The previous prime is 40561123. The next prime is 40561151. The reversal of 40561144 is 44116504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73879 + ... + 74425.

It is an arithmetic number, because the mean of its divisors is an integer number (1380960).

Almost surely, 2^40561144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40561144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44190720).

40561144 is an abundant number, since it is smaller than the sum of its proper divisors (47820296).

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

40561144 is a wasteful number, since it uses less digits than its factorization.

40561144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620 (or 616 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 40561144 is about 6368.7631452269. The cubic root of 40561144 is about 343.5870066277.

Adding to 40561144 its reverse (44116504), we get a palindrome (84677648).

The spelling of 40561144 in words is "forty million, five hundred sixty-one thousand, one hundred forty-four".