686437 has 2 divisors, whose sum is σ = 686438. Its totient is φ = 686436.

The previous prime is 686423. The next prime is 686449. The reversal of 686437 is 734686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 450241 + 236196 = 671^2 + 486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686417) 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, 343218 + 343219.

It is an arithmetic number, because the mean of its divisors is an integer number (343219).

2⁶⁸⁶⁴³⁷ is an apocalyptic number.

It is an amenable number.

686437 is a deficient number, since it is larger than the sum of its proper divisors (1).

686437 is an equidigital number, since it uses as much as digits as its factorization.

686437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 34.

The square root of 686437 is about 828.5149364978. The cubic root of 686437 is about 88.2131969154.

The spelling of 686437 in words is "six hundred eighty-six thousand, four hundred thirty-seven".