1980368639 has 2 divisors, whose sum is σ = 1980368640. Its totient is φ = 1980368638.

The previous prime is 1980368633. The next prime is 1980368659. The reversal of 1980368639 is 9368630891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1980368639 - 2⁴ = 1980368623 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1980368633) by changing a digit.

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 as a sum of consecutive naturals, namely, 990184319 + 990184320.

It is an arithmetic number, because the mean of its divisors is an integer number (990184320).

Almost surely, 2^1980368639 is an apocalyptic number.

1980368639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980368639 is an equidigital number, since it uses as much as digits as its factorization.

1980368639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1679616, while the sum is 53.

The square root of 1980368639 is about 44501.3330025068. Note that the first 3 decimals coincide. The cubic root of 1980368639 is about 1255.7851605487.

The spelling of 1980368639 in words is "one billion, nine hundred eighty million, three hundred sixty-eight thousand, six hundred thirty-nine".