998619840 has 280 divisors, whose sum is σ = 3618006480. Its totient is φ = 261384192.

The previous prime is 998619829. The next prime is 998619847. The reversal of 998619840 is 48916899.

998619840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (998619847) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1528954 + ... + 1529606.

Almost surely, 2^998619840 is an apocalyptic number.

998619840 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 998619840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1809003240).

998619840 is an abundant number, since it is smaller than the sum of its proper divisors (2619386640).

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

998619840 is a wasteful number, since it uses less digits than its factorization.

998619840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741 (or 722 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The square root of 998619840 is about 31600.9468212584. The cubic root of 998619840 is about 999.5397348552.

The spelling of 998619840 in words is "nine hundred ninety-eight million, six hundred nineteen thousand, eight hundred forty".