1980168139 has 16 divisors (see below), whose sum is σ = 2065927680. Its totient is φ = 1896425440.

The previous prime is 1980168137. The next prime is 1980168149. The reversal of 1980168139 is 9318610891.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1980168139 - 2¹ = 1980168137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1980168133) 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 15 ways as a sum of consecutive naturals, for example, 1222272 + ... + 1223890.

It is an arithmetic number, because the mean of its divisors is an integer number (129120480).

Almost surely, 2^1980168139 is an apocalyptic number.

1980168139 is a deficient number, since it is larger than the sum of its proper divisors (85759541).

1980168139 is a wasteful number, since it uses less digits than its factorization.

1980168139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2210.

The product of its (nonzero) digits is 93312, while the sum is 46.

The square root of 1980168139 is about 44499.0802039773. The cubic root of 1980168139 is about 1255.7427789743.

The spelling of 1980168139 in words is "one billion, nine hundred eighty million, one hundred sixty-eight thousand, one hundred thirty-nine".