40809090909 has 16 divisors (see below), whose sum is σ = 55315365120. Its totient is φ = 26757120000.

The previous prime is 40809090901. The next prime is 40809090919. The reversal of 40809090909 is 90909090804.

It is a happy number.

It is not a de Polignac number, because 40809090909 - 2³ = 40809090901 is a prime.

40809090909 is a modest number, since divided by 90909 gives 40809 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40809090901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274092 + ... + 395909.

It is an arithmetic number, because the mean of its divisors is an integer number (3457210320).

Almost surely, 2^40809090909 is an apocalyptic number.

It is an amenable number.

40809090909 is a deficient number, since it is larger than the sum of its proper divisors (14506274211).

40809090909 is a wasteful number, since it uses less digits than its factorization.

40809090909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670340.

The product of its (nonzero) digits is 209952, while the sum is 48.

The spelling of 40809090909 in words is "forty billion, eight hundred nine million, ninety thousand, nine hundred nine".