1986745979044 has 24 divisors (see below), whose sum is σ = 3808265622840. Its totient is φ = 902699997696.

The previous prime is 1986745978991. The next prime is 1986745979047. The reversal of 1986745979044 is 4409795476891.

It can be written as a sum of positive squares in 4 ways, for example, as 450415476900 + 1536330502144 = 671130^2 + 1239488^2 .

It is not an unprimeable number, because it can be changed into a prime (1986745979047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 503736867 + ... + 503740810.

It is an arithmetic number, because the mean of its divisors is an integer number (158677734285).

Almost surely, 2^{1986745979044} is an apocalyptic number.

It is an amenable number.

1986745979044 is a deficient number, since it is larger than the sum of its proper divisors (1821519643796).

1986745979044 is a wasteful number, since it uses less digits than its factorization.

1986745979044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007477727 (or 1007477725 counting only the distinct ones).

The product of its (nonzero) digits is 548674560, while the sum is 73.

The spelling of 1986745979044 in words is "one trillion, nine hundred eighty-six billion, seven hundred forty-five million, nine hundred seventy-nine thousand, forty-four".