1688998387 has 2 divisors, whose sum is σ = 1688998388. Its totient is φ = 1688998386.

The previous prime is 1688998373. The next prime is 1688998411. The reversal of 1688998387 is 7838998861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1688998387 - 2²³ = 1680609779 is a prime.

It is not a weakly prime, because it can be changed into another prime (1688998357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844499193 + 844499194.

It is an arithmetic number, because the mean of its divisors is an integer number (844499194).

Almost surely, 2^1688998387 is an apocalyptic number.

1688998387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688998387 is an equidigital number, since it uses as much as digits as its factorization.

1688998387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41803776, while the sum is 67.

The square root of 1688998387 is about 41097.4255519734. The cubic root of 1688998387 is about 1190.9030611913.

The spelling of 1688998387 in words is "one billion, six hundred eighty-eight million, nine hundred ninety-eight thousand, three hundred eighty-seven".