998047440 has 160 divisors (see below), whose sum is σ = 3702263040. Its totient is φ = 245666304.

The previous prime is 998047423. The next prime is 998047493. The reversal of 998047440 is 44740899.

998047440 is a `hidden beast` number, since 99 + 80 + 47 + 440 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10309 + ... + 45851.

It is an arithmetic number, because the mean of its divisors is an integer number (23139144).

Almost surely, 2^998047440 is an apocalyptic number.

998047440 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 998047440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1851131520).

998047440 is an abundant number, since it is smaller than the sum of its proper divisors (2704215600).

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

998047440 is a wasteful number, since it uses less digits than its factorization.

998047440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35578 (or 35566 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 998047440 is about 31591.8888324203. Note that the first 4 decimals coincide. The cubic root of 998047440 is about 999.3487225965.

The spelling of 998047440 in words is "nine hundred ninety-eight million, forty-seven thousand, four hundred forty".