686597 has 4 divisors (see below), whose sum is σ = 691296. Its totient is φ = 681900.

The previous prime is 686593. The next prime is 686611. The reversal of 686597 is 795686.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 686597 - 2² = 686593 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2123 + ... + 2424.

It is an arithmetic number, because the mean of its divisors is an integer number (172824).

2⁶⁸⁶⁵⁹⁷ is an apocalyptic number.

It is an amenable number.

686597 is a deficient number, since it is larger than the sum of its proper divisors (4699).

686597 is a wasteful number, since it uses less digits than its factorization.

686597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4698.

The product of its digits is 90720, while the sum is 41.

The square root of 686597 is about 828.6114891793. The cubic root of 686597 is about 88.2200501857.

The spelling of 686597 in words is "six hundred eighty-six thousand, five hundred ninety-seven".