39987863807 has 2 divisors, whose sum is σ = 39987863808. Its totient is φ = 39987863806.

The previous prime is 39987863801. The next prime is 39987863831. The reversal of 39987863807 is 70836878993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39987863807 - 2¹² = 39987859711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39987863801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19993931903 + 19993931904.

It is an arithmetic number, because the mean of its divisors is an integer number (19993931904).

Almost surely, 2^39987863807 is an apocalyptic number.

39987863807 is a deficient number, since it is larger than the sum of its proper divisors (1).

39987863807 is an equidigital number, since it uses as much as digits as its factorization.

39987863807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 109734912, while the sum is 68.

The spelling of 39987863807 in words is "thirty-nine billion, nine hundred eighty-seven million, eight hundred sixty-three thousand, eight hundred seven".