1688887 has 2 divisors, whose sum is σ = 1688888. Its totient is φ = 1688886.

The previous prime is 1688861. The next prime is 1688893. The reversal of 1688887 is 7888861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1688887 - 2⁷ = 1688759 is a prime.

It is a Chen prime.

1688887 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1688837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844443 + 844444.

It is an arithmetic number, because the mean of its divisors is an integer number (844444).

2^1688887 is an apocalyptic number.

1688887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688887 is an equidigital number, since it uses as much as digits as its factorization.

1688887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172032, while the sum is 46.

The square root of 1688887 is about 1299.5718525730. The cubic root of 1688887 is about 119.0876881171.

The spelling of 1688887 in words is "one million, six hundred eighty-eight thousand, eight hundred eighty-seven".