40809781986 has 8 divisors (see below), whose sum is σ = 81619563984. Its totient is φ = 13603260660.

The previous prime is 40809781963. The next prime is 40809781993. The reversal of 40809781986 is 68918790804.

It is a sphenic number, since it is the product of 3 distinct primes.

40809781986 is an admirable number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3400815160 + ... + 3400815171.

It is an arithmetic number, because the mean of its divisors is an integer number (10202445498).

Almost surely, 2^40809781986 is an apocalyptic number.

40809781986 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40809781986 is a wasteful number, since it uses less digits than its factorization.

40809781986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6801630336.

The product of its (nonzero) digits is 6967296, while the sum is 60.

The spelling of 40809781986 in words is "forty billion, eight hundred nine million, seven hundred eighty-one thousand, nine hundred eighty-six".