989838990 has 96 divisors (see below), whose sum is σ = 3036174336. Its totient is φ = 218946240.

The previous prime is 989838947. The next prime is 989839051. The reversal of 989838990 is 99838989.

989838990 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×989838990² = 1959562452248440200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5812 + ... + 44871.

It is an arithmetic number, because the mean of its divisors is an integer number (31626816).

Almost surely, 2^989838990 is an apocalyptic number.

989838990 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 989838990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1518087168).

989838990 is an abundant number, since it is smaller than the sum of its proper divisors (2046335346).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

989838990 is a wasteful number, since it uses less digits than its factorization.

989838990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50734 (or 50731 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 63.

The square root of 989838990 is about 31461.7067242068. The cubic root of 989838990 is about 996.6014596748.

The spelling of 989838990 in words is "nine hundred eighty-nine million, eight hundred thirty-eight thousand, nine hundred ninety".