1689287 has 2 divisors, whose sum is σ = 1689288. Its totient is φ = 1689286.

The previous prime is 1689277. The next prime is 1689319. The reversal of 1689287 is 7829861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1689287 - 2⁸ = 1689031 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1689217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844643 + 844644.

It is an arithmetic number, because the mean of its divisors is an integer number (844644).

2^1689287 is an apocalyptic number.

1689287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689287 is an equidigital number, since it uses as much as digits as its factorization.

1689287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The square root of 1689287 is about 1299.7257403006. The cubic root of 1689287 is about 119.0970890451.

The spelling of 1689287 in words is "one million, six hundred eighty-nine thousand, two hundred eighty-seven".