998653440 has 160 divisors (see below), whose sum is σ = 3380810400. Its totient is φ = 250609664.

The previous prime is 998653429. The next prime is 998653459. The reversal of 998653440 is 44356899.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 998653440.

It is a congruent number.

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, 126736 + ... + 134384.

It is an arithmetic number, because the mean of its divisors is an integer number (21130065).

Almost surely, 2^998653440 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 998653440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1690405200).

998653440 is an abundant number, since it is smaller than the sum of its proper divisors (2382156960).

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

998653440 is a wasteful number, since it uses less digits than its factorization.

998653440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7692 (or 7676 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 48.

The square root of 998653440 is about 31601.4784464272. The cubic root of 998653440 is about 999.5509450465.

The spelling of 998653440 in words is "nine hundred ninety-eight million, six hundred fifty-three thousand, four hundred forty".