1680923887 has 2 divisors, whose sum is σ = 1680923888. Its totient is φ = 1680923886.

The previous prime is 1680923873. The next prime is 1680923953. The reversal of 1680923887 is 7883290861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1680923887 - 2²⁷ = 1546706159 is a prime.

It is a super-2 number, since 2×1680923887² = 5651010227774377538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1680923857) 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, 840461943 + 840461944.

It is an arithmetic number, because the mean of its divisors is an integer number (840461944).

Almost surely, 2^1680923887 is an apocalyptic number.

1680923887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680923887 is an equidigital number, since it uses as much as digits as its factorization.

1680923887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The square root of 1680923887 is about 40999.0717821758. The cubic root of 1680923887 is about 1189.0022677699.

The spelling of 1680923887 in words is "one billion, six hundred eighty million, nine hundred twenty-three thousand, eight hundred eighty-seven".