40140081 has 6 divisors (see below), whose sum is σ = 57980130. Its totient is φ = 26760048.

The previous prime is 40140073. The next prime is 40140101. The reversal of 40140081 is 18004104.

40140081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 26010000 + 14130081 = 5100^2 + 3759^2 .

It is not a de Polignac number, because 40140081 - 2³ = 40140073 is a prime.

It is a super-2 number, since 2×40140081² = 3222452205373122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40140011) 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 5 ways as a sum of consecutive naturals, for example, 2229996 + ... + 2230013.

It is an arithmetic number, because the mean of its divisors is an integer number (9663355).

Almost surely, 2^40140081 is an apocalyptic number.

It is an amenable number.

40140081 is a deficient number, since it is larger than the sum of its proper divisors (17840049).

40140081 is a wasteful number, since it uses less digits than its factorization.

40140081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4460015 (or 4460012 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 40140081 is about 6335.6200170149. The cubic root of 40140081 is about 342.3939494420.

Adding to 40140081 its reverse (18004104), we get a palindrome (58144185).

The spelling of 40140081 in words is "forty million, one hundred forty thousand, eighty-one".