989909388 has 162 divisors, whose sum is σ = 2883433644. Its totient is φ = 286161408.

The previous prime is 989909369. The next prime is 989909399. The reversal of 989909388 is 883909989.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 1757995 + ... + 1758557.

Almost surely, 2^989909388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 989909388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1441716822).

989909388 is an abundant number, since it is smaller than the sum of its proper divisors (1893524256).

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

989909388 is a wasteful number, since it uses less digits than its factorization.

989909388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633 (or 598 counting only the distinct ones).

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

The square root of 989909388 is about 31462.8254929528. The cubic root of 989909388 is about 996.6250854318.

The spelling of 989909388 in words is "nine hundred eighty-nine million, nine hundred nine thousand, three hundred eighty-eight".