40085865 has 12 divisors (see below), whose sum is σ = 69482244. Its totient is φ = 21379104.

The previous prime is 40085831. The next prime is 40085887. The reversal of 40085865 is 56858004.

It is a happy number.

40085865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 22014864 + 18071001 = 4692^2 + 4251^2 .

It is not a de Polignac number, because 40085865 - 2⁷ = 40085737 is a prime.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 445354 + ... + 445443.

It is an arithmetic number, because the mean of its divisors is an integer number (5790187).

Almost surely, 2^40085865 is an apocalyptic number.

40085865 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40085865 is a deficient number, since it is larger than the sum of its proper divisors (29396379).

40085865 is a wasteful number, since it uses less digits than its factorization.

40085865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890808 (or 890805 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 40085865 is about 6331.3399055808. The cubic root of 40085865 is about 342.2397262501.

The spelling of 40085865 in words is "forty million, eighty-five thousand, eight hundred sixty-five".