1673809 has 2 divisors, whose sum is σ = 1673810. Its totient is φ = 1673808.

The previous prime is 1673807. The next prime is 1673813. The reversal of 1673809 is 9083761.

1673809 is nontrivially palindromic in base 5.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1096209 + 577600 = 1047^2 + 760^2 .

It is a cyclic number.

It is not a de Polignac number, because 1673809 - 2¹ = 1673807 is a prime.

Together with 1673807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1673807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 836904 + 836905.

It is an arithmetic number, because the mean of its divisors is an integer number (836905).

2^1673809 is an apocalyptic number.

It is an amenable number.

1673809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1673809 is an equidigital number, since it uses as much as digits as its factorization.

1673809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 1673809 is about 1293.7577052911. The cubic root of 1673809 is about 118.7322322447.

The spelling of 1673809 in words is "one million, six hundred seventy-three thousand, eight hundred nine".