40051540 has 12 divisors (see below), whose sum is σ = 84108276. Its totient is φ = 16020608.

The previous prime is 40051519. The next prime is 40051559. The reversal of 40051540 is 4515004.

It can be written as a sum of positive squares in 2 ways, for example, as 15904144 + 24147396 = 3988^2 + 4914^2 .

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, 1001269 + ... + 1001308.

It is an arithmetic number, because the mean of its divisors is an integer number (7009023).

Almost surely, 2^40051540 is an apocalyptic number.

It is an amenable number.

40051540 is an abundant number, since it is smaller than the sum of its proper divisors (44056736).

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

40051540 is a wasteful number, since it uses less digits than its factorization.

40051540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2002586 (or 2002584 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 40051540 is about 6328.6286034180. The cubic root of 40051540 is about 342.1420132263.

Adding to 40051540 its reverse (4515004), we get a palindrome (44566544).

The spelling of 40051540 in words is "forty million, fifty-one thousand, five hundred forty".