686735 has 12 divisors (see below), whose sum is σ = 958968. Its totient is φ = 470736.

The previous prime is 686731. The next prime is 686737. The reversal of 686735 is 537686.

It is a happy number.

It is not a de Polignac number, because 686735 - 2² = 686731 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 686695 and 686704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1157 + ... + 1646.

It is an arithmetic number, because the mean of its divisors is an integer number (79914).

2⁶⁸⁶⁷³⁵ is an apocalyptic number.

686735 is a deficient number, since it is larger than the sum of its proper divisors (272233).

686735 is a wasteful number, since it uses less digits than its factorization.

686735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2822 (or 2815 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The square root of 686735 is about 828.6947568315. The cubic root of 686735 is about 88.2259602763.

The spelling of 686735 in words is "six hundred eighty-six thousand, seven hundred thirty-five".