1998985500 has 96 divisors (see below), whose sum is σ = 6467872320. Its totient is φ = 533059200.

The previous prime is 1998985487. The next prime is 1998985501. The reversal of 1998985500 is 55898991.

1998985500 is a `hidden beast` number, since 1 + 9 + 9 + 89 + 8 + 550 + 0 = 666.

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

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998985501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60537 + ... + 87536.

It is an arithmetic number, because the mean of its divisors is an integer number (67373670).

Almost surely, 2^1998985500 is an apocalyptic number.

1998985500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1998985500 is an abundant number, since it is smaller than the sum of its proper divisors (4468886820).

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

1998985500 is a wasteful number, since it uses less digits than its factorization.

1998985500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148101 (or 148083 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 54.

The square root of 1998985500 is about 44710.0156564500. The cubic root of 1998985500 is about 1259.7079822138.

The spelling of 1998985500 in words is "one billion, nine hundred ninety-eight million, nine hundred eighty-five thousand, five hundred".