1680040889 has 2 divisors, whose sum is σ = 1680040890. Its totient is φ = 1680040888.

The previous prime is 1680040823. The next prime is 1680040891. The reversal of 1680040889 is 9880400861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1626750889 + 53290000 = 40333^2 + 7300^2 .

It is a cyclic number.

It is not a de Polignac number, because 1680040889 - 2¹² = 1680036793 is a prime.

Together with 1680040891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1680043889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840020444 + 840020445.

It is an arithmetic number, because the mean of its divisors is an integer number (840020445).

Almost surely, 2^1680040889 is an apocalyptic number.

It is an amenable number.

1680040889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680040889 is an equidigital number, since it uses as much as digits as its factorization.

1680040889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 1680040889 is about 40988.3018555295. The cubic root of 1680040889 is about 1188.7940349595.

The spelling of 1680040889 in words is "one billion, six hundred eighty million, forty thousand, eight hundred eighty-nine".