1998547800 has 48 divisors (see below), whose sum is σ = 6195500040. Its totient is φ = 532945920.

The previous prime is 1998547799. The next prime is 1998547823. The reversal of 1998547800 is 87458991.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1664857 + ... + 1666056.

Almost surely, 2^1998547800 is an apocalyptic number.

1998547800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1998547800 is an abundant number, since it is smaller than the sum of its proper divisors (4196952240).

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

1998547800 is a wasteful number, since it uses less digits than its factorization.

1998547800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3330932 (or 3330923 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 51.

The square root of 1998547800 is about 44705.1205120845. The cubic root of 1998547800 is about 1259.6160331673.

The spelling of 1998547800 in words is "one billion, nine hundred ninety-eight million, five hundred forty-seven thousand, eight hundred".