687433 has 2 divisors, whose sum is σ = 687434. Its totient is φ = 687432.

The previous prime is 687431. The next prime is 687437. The reversal of 687433 is 334786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 685584 + 1849 = 828^2 + 43^2 .

It is a cyclic number.

It is not a de Polignac number, because 687433 - 2¹ = 687431 is a prime.

Together with 687431, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 687395 and 687404.

It is not a weakly prime, because it can be changed into another prime (687431) 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, 343716 + 343717.

It is an arithmetic number, because the mean of its divisors is an integer number (343717).

2⁶⁸⁷⁴³³ is an apocalyptic number.

It is an amenable number.

687433 is a deficient number, since it is larger than the sum of its proper divisors (1).

687433 is an equidigital number, since it uses as much as digits as its factorization.

687433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 31.

The square root of 687433 is about 829.1157940843. The cubic root of 687433 is about 88.2558412192.

The spelling of 687433 in words is "six hundred eighty-seven thousand, four hundred thirty-three".