40857871 has 2 divisors, whose sum is σ = 40857872. Its totient is φ = 40857870.

The previous prime is 40857863. The next prime is 40857889. The reversal of 40857871 is 17875804.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40857871 - 2³ = 40857863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40857811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20428935 + 20428936.

It is an arithmetic number, because the mean of its divisors is an integer number (20428936).

Almost surely, 2^40857871 is an apocalyptic number.

40857871 is a deficient number, since it is larger than the sum of its proper divisors (1).

40857871 is an equidigital number, since it uses as much as digits as its factorization.

40857871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 40857871 is about 6392.0161920946. The cubic root of 40857871 is about 344.4228142235.

The spelling of 40857871 in words is "forty million, eight hundred fifty-seven thousand, eight hundred seventy-one".