1684833989 has 2 divisors, whose sum is σ = 1684833990. Its totient is φ = 1684833988.

The previous prime is 1684833979. The next prime is 1684834007. The reversal of 1684833989 is 9893384861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1600800100 + 84033889 = 40010^2 + 9167^2 .

It is an emirp because it is prime and its reverse (9893384861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1684833989 - 2²⁰ = 1683785413 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1684833919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842416994 + 842416995.

It is an arithmetic number, because the mean of its divisors is an integer number (842416995).

Almost surely, 2^1684833989 is an apocalyptic number.

It is an amenable number.

1684833989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1684833989 is an equidigital number, since it uses as much as digits as its factorization.

1684833989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8957952, while the sum is 59.

The square root of 1684833989 is about 41046.7293337727. The cubic root of 1684833989 is about 1189.9234913031.

The spelling of 1684833989 in words is "one billion, six hundred eighty-four million, eight hundred thirty-three thousand, nine hundred eighty-nine".