40412681 has 2 divisors, whose sum is σ = 40412682. Its totient is φ = 40412680.

The previous prime is 40412609. The next prime is 40412707. The reversal of 40412681 is 18621404.

It is an a-pointer prime, because the next prime (40412707) can be obtained adding 40412681 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37100281 + 3312400 = 6091^2 + 1820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40412681 is a prime.

It is a super-2 number, since 2×40412681² = 3266369571215522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40412681.

It is not a weakly prime, because it can be changed into another prime (40414681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20206340 + 20206341.

It is an arithmetic number, because the mean of its divisors is an integer number (20206341).

Almost surely, 2^40412681 is an apocalyptic number.

It is an amenable number.

40412681 is a deficient number, since it is larger than the sum of its proper divisors (1).

40412681 is an equidigital number, since it uses as much as digits as its factorization.

40412681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 40412681 is about 6357.0969003154. The cubic root of 40412681 is about 343.1672919648.

The spelling of 40412681 in words is "forty million, four hundred twelve thousand, six hundred eighty-one".