40115540 has 12 divisors (see below), whose sum is σ = 84242676. Its totient is φ = 16046208.

The previous prime is 40115527. The next prime is 40115557. The reversal of 40115540 is 4551104.

It can be written as a sum of positive squares in 2 ways, for example, as 15335056 + 24780484 = 3916^2 + 4978^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 2005777 = 40115540 / (4 + 0 + 1 + 1 + 5 + 5 + 4 + 0).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1002869 + ... + 1002908.

It is an arithmetic number, because the mean of its divisors is an integer number (7020223).

Almost surely, 2^40115540 is an apocalyptic number.

It is an amenable number.

40115540 is an abundant number, since it is smaller than the sum of its proper divisors (44127136).

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

40115540 is a wasteful number, since it uses less digits than its factorization.

40115540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2005786 (or 2005784 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 40115540 is about 6333.6829728050. The cubic root of 40115540 is about 342.3241571653.

Adding to 40115540 its reverse (4551104), we get a palindrome (44666644).

The spelling of 40115540 in words is "forty million, one hundred fifteen thousand, five hundred forty".