987839987 has 2 divisors, whose sum is σ = 987839988. Its totient is φ = 987839986.

The previous prime is 987839971. The next prime is 987840013. The reversal of 987839987 is 789938789.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 987839987 - 2⁴ = 987839971 is a prime.

It is not a weakly prime, because it can be changed into another prime (987839687) 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, 493919993 + 493919994.

It is an arithmetic number, because the mean of its divisors is an integer number (493919994).

Almost surely, 2^987839987 is an apocalyptic number.

987839987 is a deficient number, since it is larger than the sum of its proper divisors (1).

987839987 is an equidigital number, since it uses as much as digits as its factorization.

987839987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54867456, while the sum is 68.

The square root of 987839987 is about 31429.9218420918. The cubic root of 987839987 is about 995.9301208884.

The spelling of 987839987 in words is "nine hundred eighty-seven million, eight hundred thirty-nine thousand, nine hundred eighty-seven".