1673209 has 2 divisors, whose sum is σ = 1673210. Its totient is φ = 1673208.

The previous prime is 1673207. The next prime is 1673237. The reversal of 1673209 is 9023761.

It is an a-pointer prime, because the next prime (1673237) can be obtained adding 1673209 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1617984 + 55225 = 1272^2 + 235^2 .

It is a cyclic number.

It is not a de Polignac number, because 1673209 - 2¹ = 1673207 is a prime.

Together with 1673207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1673207) 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, 836604 + 836605.

It is an arithmetic number, because the mean of its divisors is an integer number (836605).

2^1673209 is an apocalyptic number.

It is an amenable number.

1673209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1673209 is an equidigital number, since it uses as much as digits as its factorization.

1673209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 1673209 is about 1293.5258018300. The cubic root of 1673209 is about 118.7180434786.

The spelling of 1673209 in words is "one million, six hundred seventy-three thousand, two hundred nine".