1998198180 has 96 divisors (see below), whose sum is σ = 6781783680. Its totient is φ = 484410240.

The previous prime is 1998198179. The next prime is 1998198229. The reversal of 1998198180 is 818918991.

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

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, 162259 + ... + 174138.

It is an arithmetic number, because the mean of its divisors is an integer number (70643580).

Almost surely, 2^1998198180 is an apocalyptic number.

1998198180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1998198180 is an abundant number, since it is smaller than the sum of its proper divisors (4783585500).

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

1998198180 is a wasteful number, since it uses less digits than its factorization.

1998198180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336426 (or 336418 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 54.

The square root of 1998198180 is about 44701.2100507358. The cubic root of 1998198180 is about 1259.5425777246.

The spelling of 1998198180 in words is "one billion, nine hundred ninety-eight million, one hundred ninety-eight thousand, one hundred eighty".