909898989 has 16 divisors (see below), whose sum is σ = 1220401728. Its totient is φ = 603009792.

The previous prime is 909898981. The next prime is 909899027. The reversal of 909898989 is 989898909.

It is not a de Polignac number, because 909898989 - 2³ = 909898981 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (909898981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 400234 + ... + 402500.

It is an arithmetic number, because the mean of its divisors is an integer number (76275108).

Almost surely, 2^909898989 is an apocalyptic number.

It is an amenable number.

909898989 is a deficient number, since it is larger than the sum of its proper divisors (310502739).

909898989 is a wasteful number, since it uses less digits than its factorization.

909898989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3004.

The product of its (nonzero) digits is 30233088, while the sum is 69.

The square root of 909898989 is about 30164.5319705113. The cubic root of 909898989 is about 969.0162517336.

The spelling of 909898989 in words is "nine hundred nine million, eight hundred ninety-eight thousand, nine hundred eighty-nine".