40857889 has 2 divisors, whose sum is σ = 40857890. Its totient is φ = 40857888.

The previous prime is 40857871. The next prime is 40857911. The reversal of 40857889 is 98875804.

40857889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40857664 + 225 = 6392^2 + 15^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40857889 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40857389) 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 as a sum of consecutive naturals, namely, 20428944 + 20428945.

It is an arithmetic number, because the mean of its divisors is an integer number (20428945).

Almost surely, 2^40857889 is an apocalyptic number.

It is an amenable number.

40857889 is a deficient number, since it is larger than the sum of its proper divisors (1).

40857889 is an equidigital number, since it uses as much as digits as its factorization.

40857889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 645120, while the sum is 49.

The square root of 40857889 is about 6392.0176001009. The cubic root of 40857889 is about 344.4228648021.

The spelling of 40857889 in words is "forty million, eight hundred fifty-seven thousand, eight hundred eighty-nine".