1688143 has 2 divisors, whose sum is σ = 1688144. Its totient is φ = 1688142.

The previous prime is 1688123. The next prime is 1688147. The reversal of 1688143 is 3418861.

It is a strong prime.

It is an emirp because it is prime and its reverse (3418861) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1688143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1688147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844071 + 844072.

It is an arithmetic number, because the mean of its divisors is an integer number (844072).

2^1688143 is an apocalyptic number.

1688143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688143 is an equidigital number, since it uses as much as digits as its factorization.

1688143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 31.

The square root of 1688143 is about 1299.2855729207. The cubic root of 1688143 is about 119.0701984422.

The spelling of 1688143 in words is "one million, six hundred eighty-eight thousand, one hundred forty-three".