989835840 has 336 divisors, whose sum is σ = 3999171072. Its totient is φ = 219967488.

The previous prime is 989835827. The next prime is 989835851. The reversal of 989835840 is 48538989.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (336).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 745257 + ... + 746583.

Almost surely, 2^989835840 is an apocalyptic number.

989835840 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 989835840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1999585536).

989835840 is an abundant number, since it is smaller than the sum of its proper divisors (3009335232).

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

989835840 is a wasteful number, since it uses less digits than its factorization.

989835840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1394 (or 1381 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The square root of 989835840 is about 31461.6566633100. The cubic root of 989835840 is about 996.6004025002.

The spelling of 989835840 in words is "nine hundred eighty-nine million, eight hundred thirty-five thousand, eight hundred forty".