987949917 has 24 divisors (see below), whose sum is σ = 1543142016. Its totient is φ = 606696576.

The previous prime is 987949909. The next prime is 987949957. The reversal of 987949917 is 719949789.

It is not a de Polignac number, because 987949917 - 2³ = 987949909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987949957) 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 in 23 ways as a sum of consecutive naturals, for example, 61503 + ... + 75884.

It is an arithmetic number, because the mean of its divisors is an integer number (64297584).

Almost surely, 2^987949917 is an apocalyptic number.

It is an amenable number.

987949917 is a deficient number, since it is larger than the sum of its proper divisors (555192099).

987949917 is a wasteful number, since it uses less digits than its factorization.

987949917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137457 (or 137454 counting only the distinct ones).

The product of its digits is 10287648, while the sum is 63.

The square root of 987949917 is about 31431.6706046624. The cubic root of 987949917 is about 995.9670629501.

The spelling of 987949917 in words is "nine hundred eighty-seven million, nine hundred forty-nine thousand, nine hundred seventeen".