686737 has 2 divisors, whose sum is σ = 686738. Its totient is φ = 686736.

The previous prime is 686731. The next prime is 686761. The reversal of 686737 is 737686.

686737 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 583696 + 103041 = 764^2 + 321^2 .

It is a cyclic number.

It is not a de Polignac number, because 686737 - 2³ = 686729 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 686696 and 686705.

It is not a weakly prime, because it can be changed into another prime (686731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343368 + 343369.

It is an arithmetic number, because the mean of its divisors is an integer number (343369).

2⁶⁸⁶⁷³⁷ is an apocalyptic number.

It is an amenable number.

686737 is a deficient number, since it is larger than the sum of its proper divisors (1).

686737 is an equidigital number, since it uses as much as digits as its factorization.

686737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 37.

The square root of 686737 is about 828.6959635475. The cubic root of 686737 is about 88.2260459240.

The spelling of 686737 in words is "six hundred eighty-six thousand, seven hundred thirty-seven".