39981259866 has 8 divisors (see below), whose sum is σ = 79962519744. Its totient is φ = 13327086620.

The previous prime is 39981259861. The next prime is 39981259883. The reversal of 39981259866 is 66895218993.

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

39981259866 is an admirable number.

It is a super-2 number, since 2×39981259866² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 39981259797 and 39981259806.

It is not an unprimeable number, because it can be changed into a prime (39981259861) 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 3 ways as a sum of consecutive naturals, for example, 3331771650 + ... + 3331771661.

It is an arithmetic number, because the mean of its divisors is an integer number (9995314968).

Almost surely, 2^39981259866 is an apocalyptic number.

39981259866 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.

39981259866 is a wasteful number, since it uses less digits than its factorization.

39981259866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6663543316.

The product of its digits is 50388480, while the sum is 66.

The spelling of 39981259866 in words is "thirty-nine billion, nine hundred eighty-one million, two hundred fifty-nine thousand, eight hundred sixty-six".