39927665987 has 4 divisors (see below), whose sum is σ = 43557453816. Its totient is φ = 36297878160.

The previous prime is 39927665983. The next prime is 39927665993. The reversal of 39927665987 is 78956672993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 39927665987 - 2² = 39927665983 is a prime.

It is a super-3 number, since 3×39927665987³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 39927665987.

It is not an unprimeable number, because it can be changed into a prime (39927665983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1814893898 + ... + 1814893919.

It is an arithmetic number, because the mean of its divisors is an integer number (10889363454).

Almost surely, 2^39927665987 is an apocalyptic number.

39927665987 is a deficient number, since it is larger than the sum of its proper divisors (3629787829).

39927665987 is a wasteful number, since it uses less digits than its factorization.

39927665987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3629787828.

The product of its digits is 308629440, while the sum is 71.

The spelling of 39927665987 in words is "thirty-nine billion, nine hundred twenty-seven million, six hundred sixty-five thousand, nine hundred eighty-seven".