1981898184 has 32 divisors (see below), whose sum is σ = 5662566720. Its totient is φ = 566256576.

The previous prime is 1981898173. The next prime is 1981898197. The reversal of 1981898184 is 4818981891.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5898339 + ... + 5898674.

It is an arithmetic number, because the mean of its divisors is an integer number (176955210).

Almost surely, 2^1981898184 is an apocalyptic number.

1981898184 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1981898184 is an abundant number, since it is smaller than the sum of its proper divisors (3680668536).

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

1981898184 is a wasteful number, since it uses less digits than its factorization.

1981898184 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11797029 (or 11797025 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 57.

The square root of 1981898184 is about 44518.5150695753. The cubic root of 1981898184 is about 1256.1083807783.

The spelling of 1981898184 in words is "one billion, nine hundred eighty-one million, eight hundred ninety-eight thousand, one hundred eighty-four".