40065689 has 2 divisors, whose sum is σ = 40065690. Its totient is φ = 40065688.

The previous prime is 40065679. The next prime is 40065703. The reversal of 40065689 is 98656004.

40065689 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., 30250000 + 9815689 = 5500^2 + 3133^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40065689 is a prime.

It is a super-3 number, since 3×40065689³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40065629) 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, 20032844 + 20032845.

It is an arithmetic number, because the mean of its divisors is an integer number (20032845).

Almost surely, 2^40065689 is an apocalyptic number.

It is an amenable number.

40065689 is a deficient number, since it is larger than the sum of its proper divisors (1).

40065689 is an equidigital number, since it uses as much as digits as its factorization.

40065689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 40065689 is about 6329.7463614271. The cubic root of 40065689 is about 342.1822979645.

The spelling of 40065689 in words is "forty million, sixty-five thousand, six hundred eighty-nine".