40865857 has 2 divisors, whose sum is σ = 40865858. Its totient is φ = 40865856.

The previous prime is 40865849. The next prime is 40865897. The reversal of 40865857 is 75856804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21864976 + 19000881 = 4676^2 + 4359^2 .

It is a cyclic number.

It is not a de Polignac number, because 40865857 - 2³ = 40865849 is a prime.

It is a super-3 number, since 3×40865857³ (a number of 24 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (40865837) by changing a digit.

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 as a sum of consecutive naturals, namely, 20432928 + 20432929.

It is an arithmetic number, because the mean of its divisors is an integer number (20432929).

Almost surely, 2^40865857 is an apocalyptic number.

It is an amenable number.

40865857 is a deficient number, since it is larger than the sum of its proper divisors (1).

40865857 is an equidigital number, since it uses as much as digits as its factorization.

40865857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 268800, while the sum is 43.

The square root of 40865857 is about 6392.6408470991. The cubic root of 40865857 is about 344.4452528327.

The spelling of 40865857 in words is "forty million, eight hundred sixty-five thousand, eight hundred fifty-seven".