8631987 has 24 divisors (see below), whose sum is σ = 14421456. Its totient is φ = 4552128.

The previous prime is 8631979. The next prime is 8632003. The reversal of 8631987 is 7891368.

It is not a de Polignac number, because 8631987 - 2³ = 8631979 is a prime.

It is a super-2 number, since 2×8631987² = 149022399136338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8631907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 348 + ... + 4169.

It is an arithmetic number, because the mean of its divisors is an integer number (600894).

Almost surely, 2^8631987 is an apocalyptic number.

8631987 is a deficient number, since it is larger than the sum of its proper divisors (5789469).

8631987 is a wasteful number, since it uses less digits than its factorization.

8631987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4547 (or 4540 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The square root of 8631987 is about 2938.0243361824. The cubic root of 8631987 is about 205.1336586228.

It can be divided in two parts, 863 and 1987, that added together give a triangular number (2850 = T₇₅).

The spelling of 8631987 in words is "eight million, six hundred thirty-one thousand, nine hundred eighty-seven".