1981059804 has 18 divisors (see below), whose sum is σ = 5007679040. Its totient is φ = 660353256.

The previous prime is 1981059791. The next prime is 1981059841. The reversal of 1981059804 is 4089501891.

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 1981059804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27514684 + ... + 27514755.

Almost surely, 2^1981059804 is an apocalyptic number.

It is an amenable number.

1981059804 is an abundant number, since it is smaller than the sum of its proper divisors (3026619236).

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

1981059804 is a wasteful number, since it uses less digits than its factorization.

1981059804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55029449 (or 55029444 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 1981059804 is about 44509.0979913096. The cubic root of 1981059804 is about 1255.9312366847.

The spelling of 1981059804 in words is "one billion, nine hundred eighty-one million, fifty-nine thousand, eight hundred four".