1689437 has 2 divisors, whose sum is σ = 1689438. Its totient is φ = 1689436.

The previous prime is 1689431. The next prime is 1689451. The reversal of 1689437 is 7349861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1207801 + 481636 = 1099^2 + 694^2 .

It is a cyclic number.

It is not a de Polignac number, because 1689437 - 2¹⁰ = 1688413 is a prime.

It is a Chen prime.

It is a nialpdrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 1689437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1689431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844718 + 844719.

It is an arithmetic number, because the mean of its divisors is an integer number (844719).

2^1689437 is an apocalyptic number.

It is an amenable number.

1689437 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689437 is an equidigital number, since it uses as much as digits as its factorization.

1689437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 1689437 is about 1299.7834435013. The cubic root of 1689437 is about 119.1006140105.

The spelling of 1689437 in words is "one million, six hundred eighty-nine thousand, four hundred thirty-seven".