989898987 has 32 divisors (see below), whose sum is σ = 1652820480. Its totient is φ = 511960320.

The previous prime is 989898983. The next prime is 989898989. The reversal of 989898987 is 789898989.

989898987 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 989898987 - 2² = 989898983 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (989898983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43543 + ... + 62255.

It is an arithmetic number, because the mean of its divisors is an integer number (51650640).

Almost surely, 2^989898987 is an apocalyptic number.

989898987 is a deficient number, since it is larger than the sum of its proper divisors (662921493).

989898987 is a wasteful number, since it uses less digits than its factorization.

989898987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18963.

The product of its digits is 188116992, while the sum is 75.

The square root of 989898987 is about 31462.6602022143. The cubic root of 989898987 is about 996.6215948989.

The spelling of 989898987 in words is "nine hundred eighty-nine million, eight hundred ninety-eight thousand, nine hundred eighty-seven".