40857865 has 4 divisors (see below), whose sum is σ = 49029444. Its totient is φ = 32686288.

The previous prime is 40857863. The next prime is 40857871. The reversal of 40857865 is 56875804.

40857865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7634169 + 33223696 = 2763^2 + 5764^2 .

It is a cyclic number.

It is not a de Polignac number, because 40857865 - 2¹ = 40857863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40857863) 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 3 ways as a sum of consecutive naturals, for example, 4085782 + ... + 4085791.

It is an arithmetic number, because the mean of its divisors is an integer number (12257361).

Almost surely, 2^40857865 is an apocalyptic number.

It is an amenable number.

40857865 is a deficient number, since it is larger than the sum of its proper divisors (8171579).

40857865 is an equidigital number, since it uses as much as digits as its factorization.

40857865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8171578.

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

The square root of 40857865 is about 6392.0157227591. The cubic root of 40857865 is about 344.4227973639.

The spelling of 40857865 in words is "forty million, eight hundred fifty-seven thousand, eight hundred sixty-five".