1680823939 has 2 divisors, whose sum is σ = 1680823940. Its totient is φ = 1680823938.

The previous prime is 1680823891. The next prime is 1680823993. The reversal of 1680823939 is 9393280861.

Together with next prime (1680823993) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1680823939 - 2⁹ = 1680823427 is a prime.

It is a super-2 number, since 2×1680823939² = 5650338227830951442, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1680823892 and 1680823901.

It is not a weakly prime, because it can be changed into another prime (1680823139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840411969 + 840411970.

It is an arithmetic number, because the mean of its divisors is an integer number (840411970).

Almost surely, 2^1680823939 is an apocalyptic number.

1680823939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680823939 is an equidigital number, since it uses as much as digits as its factorization.

1680823939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 1680823939 is about 40997.8528584120. The cubic root of 1680823939 is about 1188.9787012152.

The spelling of 1680823939 in words is "one billion, six hundred eighty million, eight hundred twenty-three thousand, nine hundred thirty-nine".