39987863831 has 2 divisors, whose sum is σ = 39987863832. Its totient is φ = 39987863830.

The previous prime is 39987863807. The next prime is 39987863869. The reversal of 39987863831 is 13836878993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39987863831 - 2²⁶ = 39920754967 is a prime.

It is a super-2 number, since 2×39987863831² (a number of 22 digits) contains 22 as substring.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19993931915 + 19993931916.

It is an arithmetic number, because the mean of its divisors is an integer number (19993931916).

Almost surely, 2^39987863831 is an apocalyptic number.

39987863831 is a deficient number, since it is larger than the sum of its proper divisors (1).

39987863831 is an equidigital number, since it uses as much as digits as its factorization.

39987863831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47029248, while the sum is 65.

The spelling of 39987863831 in words is "thirty-nine billion, nine hundred eighty-seven million, eight hundred sixty-three thousand, eight hundred thirty-one".