1981337886 has 24 divisors (see below), whose sum is σ = 4683162744. Its totient is φ = 600405360.

The previous prime is 1981337881. The next prime is 1981337887. The reversal of 1981337886 is 6887331891.

1981337886 is a `hidden beast` number, since 198 + 1 + 3 + 378 + 86 = 666.

It is a super-3 number, since 3×1981337886³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981337881) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5003181 + ... + 5003576.

It is an arithmetic number, because the mean of its divisors is an integer number (195131781).

Almost surely, 2^1981337886 is an apocalyptic number.

1981337886 is an abundant number, since it is smaller than the sum of its proper divisors (2701824858).

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

1981337886 is a wasteful number, since it uses less digits than its factorization.

1981337886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10006776 (or 10006773 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 1981337886 is about 44512.2217598717. The cubic root of 1981337886 is about 1255.9899990921.

The spelling of 1981337886 in words is "one billion, nine hundred eighty-one million, three hundred thirty-seven thousand, eight hundred eighty-six".