989898787 has 4 divisors (see below), whose sum is σ = 990048816. Its totient is φ = 989748760.

The previous prime is 989898781. The next prime is 989898809. The reversal of 989898787 is 787898989.

989898787 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 787898989 = 587 ⋅1342247.

It is a cyclic number.

It is not a de Polignac number, because 989898787 - 2²⁷ = 855681059 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989898781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64639 + ... + 78472.

It is an arithmetic number, because the mean of its divisors is an integer number (247512204).

Almost surely, 2^989898787 is an apocalyptic number.

989898787 is a deficient number, since it is larger than the sum of its proper divisors (150029).

989898787 is a wasteful number, since it uses less digits than its factorization.

989898787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150028.

The product of its digits is 146313216, while the sum is 73.

The square root of 989898787 is about 31462.6570238434. The cubic root of 989898787 is about 996.6215277795.

The spelling of 989898787 in words is "nine hundred eighty-nine million, eight hundred ninety-eight thousand, seven hundred eighty-seven".