1689379 has 2 divisors, whose sum is σ = 1689380. Its totient is φ = 1689378.

The previous prime is 1689377. The next prime is 1689397. The reversal of 1689379 is 9739861.

Together with next prime (1689397) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1689379 - 2¹ = 1689377 is a prime.

Together with 1689377, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1689377) 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, 844689 + 844690.

It is an arithmetic number, because the mean of its divisors is an integer number (844690).

2^1689379 is an apocalyptic number.

1689379 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689379 is an equidigital number, since it uses as much as digits as its factorization.

1689379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 43.

The square root of 1689379 is about 1299.7611319008. The cubic root of 1689379 is about 119.0992510486.

The spelling of 1689379 in words is "one million, six hundred eighty-nine thousand, three hundred seventy-nine".