686397 has 4 divisors (see below), whose sum is σ = 915200. Its totient is φ = 457596.

The previous prime is 686363. The next prime is 686417. The reversal of 686397 is 793686.

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 not a de Polignac number, because 686397 - 2⁶ = 686333 is a prime.

It is a super-2 number, since 2×686397² = 942281683218, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

686397 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686317) 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, 114397 + ... + 114402.

It is an arithmetic number, because the mean of its divisors is an integer number (228800).

2⁶⁸⁶³⁹⁷ is an apocalyptic number.

It is an amenable number.

686397 is a deficient number, since it is larger than the sum of its proper divisors (228803).

686397 is a wasteful number, since it uses less digits than its factorization.

686397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228802.

The product of its digits is 54432, while the sum is 39.

The square root of 686397 is about 828.4907965693. The cubic root of 686397 is about 88.2114834314.

The spelling of 686397 in words is "six hundred eighty-six thousand, three hundred ninety-seven".