40818559 has 4 divisors (see below), whose sum is σ = 40859560. Its totient is φ = 40777560.

The previous prime is 40818523. The next prime is 40818671. The reversal of 40818559 is 95581804.

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

It is a cyclic number.

It is not a de Polignac number, because 40818559 - 2⁹ = 40818047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40818059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18969 + ... + 21010.

It is an arithmetic number, because the mean of its divisors is an integer number (10214890).

Almost surely, 2^40818559 is an apocalyptic number.

40818559 is a deficient number, since it is larger than the sum of its proper divisors (41001).

40818559 is a wasteful number, since it uses less digits than its factorization.

40818559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41000.

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 40818559 is about 6388.9403659762. The cubic root of 40818559 is about 344.3123149552.

The spelling of 40818559 in words is "forty million, eight hundred eighteen thousand, five hundred fifty-nine".