989409408 has 128 divisors (see below), whose sum is σ = 2891185920. Its totient is φ = 297885696.

The previous prime is 989409397. The next prime is 989409413. The reversal of 989409408 is 804904989.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232516 + ... + 236732.

It is an arithmetic number, because the mean of its divisors is an integer number (22587390).

Almost surely, 2^989409408 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 989409408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1445592960).

989409408 is an abundant number, since it is smaller than the sum of its proper divisors (1901776512).

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

989409408 is a wasteful number, since it uses less digits than its factorization.

989409408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4294 (or 4282 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 51.

The square root of 989409408 is about 31454.8789220369. The cubic root of 989409408 is about 996.4572665278.

The spelling of 989409408 in words is "nine hundred eighty-nine million, four hundred nine thousand, four hundred eight".