1980505144 has 8 divisors (see below), whose sum is σ = 3713447160. Its totient is φ = 990252568.

The previous prime is 1980505139. The next prime is 1980505159. The reversal of 1980505144 is 4415050891.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123781564 + ... + 123781579.

It is an arithmetic number, because the mean of its divisors is an integer number (464180895).

Almost surely, 2^1980505144 is an apocalyptic number.

It is an amenable number.

1980505144 is a deficient number, since it is larger than the sum of its proper divisors (1732942016).

1980505144 is a wasteful number, since it uses less digits than its factorization.

1980505144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247563149 (or 247563145 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 1980505144 is about 44502.8666941805. The cubic root of 1980505144 is about 1255.8140132602.

The spelling of 1980505144 in words is "one billion, nine hundred eighty million, five hundred five thousand, one hundred forty-four".