39981820542 has 8 divisors (see below), whose sum is σ = 79963641096. Its totient is φ = 13327273512.

The previous prime is 39981820513. The next prime is 39981820559. The reversal of 39981820542 is 24502818993.

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

39981820542 is an admirable number.

It is a congruent number.

It is an unprimeable number.

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, 3331818373 + ... + 3331818384.

It is an arithmetic number, because the mean of its divisors is an integer number (9995455137).

Almost surely, 2^39981820542 is an apocalyptic number.

39981820542 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.

39981820542 is a wasteful number, since it uses less digits than its factorization.

39981820542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6663636762.

The product of its (nonzero) digits is 1244160, while the sum is 51.

The spelling of 39981820542 in words is "thirty-nine billion, nine hundred eighty-one million, eight hundred twenty thousand, five hundred forty-two".