39942563509 has 8 divisors (see below), whose sum is σ = 40190935680. Its totient is φ = 39694301136.

The previous prime is 39942563501. The next prime is 39942563543. The reversal of 39942563509 is 90536524993.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 39942563509 - 2³ = 39942563501 is a prime.

It is a super-3 number, since 3×39942563509³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39942563509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39942563501) 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 7 ways as a sum of consecutive naturals, for example, 774792 + ... + 824734.

It is an arithmetic number, because the mean of its divisors is an integer number (5023866960).

Almost surely, 2^39942563509 is an apocalyptic number.

It is an amenable number.

39942563509 is a deficient number, since it is larger than the sum of its proper divisors (248372171).

39942563509 is a wasteful number, since it uses less digits than its factorization.

39942563509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54899.

The product of its (nonzero) digits is 7873200, while the sum is 55.

The spelling of 39942563509 in words is "thirty-nine billion, nine hundred forty-two million, five hundred sixty-three thousand, five hundred nine".