39987863809 has 8 divisors (see below), whose sum is σ = 42103178240. Its totient is φ = 37873618416.

The previous prime is 39987863807. The next prime is 39987863831. The reversal of 39987863809 is 90836878993.

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 39987863809 - 2¹ = 39987863807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39987863801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189894 + ... + 340639.

It is an arithmetic number, because the mean of its divisors is an integer number (5262897280).

Almost surely, 2^39987863809 is an apocalyptic number.

It is an amenable number.

39987863809 is a deficient number, since it is larger than the sum of its proper divisors (2115314431).

39987863809 is a wasteful number, since it uses less digits than its factorization.

39987863809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534519.

The product of its (nonzero) digits is 141087744, while the sum is 70.

The spelling of 39987863809 in words is "thirty-nine billion, nine hundred eighty-seven million, eight hundred sixty-three thousand, eight hundred nine".