673643 has 2 divisors, whose sum is σ = 673644. Its totient is φ = 673642.

The previous prime is 673639. The next prime is 673649. The reversal of 673643 is 346376.

It is a weak prime.

673643 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 673643 - 2² = 673639 is a prime.

It is a Sophie Germain prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 673643.

It is not a weakly prime, because it can be changed into another prime (673649) 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, 336821 + 336822.

It is an arithmetic number, because the mean of its divisors is an integer number (336822).

2⁶⁷³⁶⁴³ is an apocalyptic number.

673643 is a deficient number, since it is larger than the sum of its proper divisors (1).

673643 is an equidigital number, since it uses as much as digits as its factorization.

673643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 29.

The square root of 673643 is about 820.7575768764. The cubic root of 673643 is about 87.6617091238.

The spelling of 673643 in words is "six hundred seventy-three thousand, six hundred forty-three".