987878987 has 2 divisors, whose sum is σ = 987878988. Its totient is φ = 987878986.

The previous prime is 987878971. The next prime is 987878999. The reversal of 987878987 is 789878789.

It is a happy number.

987878987 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 987878987 - 2⁴ = 987878971 is a prime.

It is a super-3 number, since 3×987878987³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 987878987.

It is not a weakly prime, because it can be changed into another prime (987872987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493939493 + 493939494.

It is an arithmetic number, because the mean of its divisors is an integer number (493939494).

Almost surely, 2^987878987 is an apocalyptic number.

987878987 is a deficient number, since it is larger than the sum of its proper divisors (1).

987878987 is an equidigital number, since it uses as much as digits as its factorization.

987878987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113799168, while the sum is 71.

The square root of 987878987 is about 31430.5422638554. The cubic root of 987878987 is about 995.9432271823.

The spelling of 987878987 in words is "nine hundred eighty-seven million, eight hundred seventy-eight thousand, nine hundred eighty-seven".