673656439 has 2 divisors, whose sum is σ = 673656440. Its totient is φ = 673656438.

The previous prime is 673656421. The next prime is 673656481. The reversal of 673656439 is 934656376.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 673656439 - 2¹¹ = 673654391 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 673656392 and 673656401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (673656239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336828219 + 336828220.

It is an arithmetic number, because the mean of its divisors is an integer number (336828220).

Almost surely, 2^673656439 is an apocalyptic number.

673656439 is a deficient number, since it is larger than the sum of its proper divisors (1).

673656439 is an equidigital number, since it uses as much as digits as its factorization.

673656439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 49.

The square root of 673656439 is about 25954.8923904531. The cubic root of 673656439 is about 876.6229206261.

The spelling of 673656439 in words is "six hundred seventy-three million, six hundred fifty-six thousand, four hundred thirty-nine".