1998226000 has 80 divisors (see below), whose sum is σ = 4893258240. Its totient is φ = 789110400.

The previous prime is 1998225997. The next prime is 1998226003. The reversal of 1998226000 is 6228991.

It is an interprime number because it is at equal distance from previous prime (1998225997) and next prime (1998226003).

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998226003) by changing a digit.

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, 151677 + ... + 164323.

It is an arithmetic number, because the mean of its divisors is an integer number (61165728).

Almost surely, 2^1998226000 is an apocalyptic number.

1998226000 is a gapful number since it is divisible by the number (10) 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 1998226000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2446629120).

1998226000 is an abundant number, since it is smaller than the sum of its proper divisors (2895032240).

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

1998226000 is a wasteful number, since it uses less digits than its factorization.

1998226000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12749 (or 12733 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1998226000 is about 44701.5212269113. The cubic root of 1998226000 is about 1259.5484230427.

The spelling of 1998226000 in words is "one billion, nine hundred ninety-eight million, two hundred twenty-six thousand".