687443 has 2 divisors, whose sum is σ = 687444. Its totient is φ = 687442.

The previous prime is 687437. The next prime is 687457. The reversal of 687443 is 344786.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 687443 - 2¹⁴ = 671059 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 687443.

It is not a weakly prime, because it can be changed into another prime (687403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343721 + 343722.

It is an arithmetic number, because the mean of its divisors is an integer number (343722).

2⁶⁸⁷⁴⁴³ is an apocalyptic number.

687443 is a deficient number, since it is larger than the sum of its proper divisors (1).

687443 is an equidigital number, since it uses as much as digits as its factorization.

687443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 32.

The square root of 687443 is about 829.1218245831. The cubic root of 687443 is about 88.2562691660.

The spelling of 687443 in words is "six hundred eighty-seven thousand, four hundred forty-three".