673609 has 2 divisors, whose sum is σ = 673610. Its totient is φ = 673608.

The previous prime is 673579. The next prime is 673613. The reversal of 673609 is 906376.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 558009 + 115600 = 747^2 + 340^2 .

It is a cyclic number.

It is not a de Polignac number, because 673609 - 2¹⁷ = 542537 is a prime.

673609 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (673619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336804 + 336805.

It is an arithmetic number, because the mean of its divisors is an integer number (336805).

2⁶⁷³⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

673609 is a deficient number, since it is larger than the sum of its proper divisors (1).

673609 is an equidigital number, since it uses as much as digits as its factorization.

673609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 673609 is about 820.7368640435. The cubic root of 673609 is about 87.6602342832.

The spelling of 673609 in words is "six hundred seventy-three thousand, six hundred nine".