1981640034 has 24 divisors (see below), whose sum is σ = 4683876912. Its totient is φ = 600496920.

The previous prime is 1981640009. The next prime is 1981640047. The reversal of 1981640034 is 4300461891.

1981640034 is a `hidden beast` number, since 1 + 9 + 8 + 1 + 640 + 0 + 3 + 4 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5003944 + ... + 5004339.

It is an arithmetic number, because the mean of its divisors is an integer number (195161538).

Almost surely, 2^1981640034 is an apocalyptic number.

1981640034 is an abundant number, since it is smaller than the sum of its proper divisors (2702236878).

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

1981640034 is a wasteful number, since it uses less digits than its factorization.

1981640034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10008302 (or 10008299 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 1981640034 is about 44515.6156196901. The cubic root of 1981640034 is about 1256.0538407316.

The spelling of 1981640034 in words is "one billion, nine hundred eighty-one million, six hundred forty thousand, thirty-four".