686733 has 4 divisors (see below), whose sum is σ = 915648. Its totient is φ = 457820.

The previous prime is 686731. The next prime is 686737. The reversal of 686733 is 337686.

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 686733 - 2¹ = 686731 is a prime.

It is a D-number.

686733 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 686694 and 686703.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114453 + ... + 114458.

It is an arithmetic number, because the mean of its divisors is an integer number (228912).

2⁶⁸⁶⁷³³ is an apocalyptic number.

It is an amenable number.

686733 is a deficient number, since it is larger than the sum of its proper divisors (228915).

686733 is a wasteful number, since it uses less digits than its factorization.

686733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228914.

The product of its digits is 18144, while the sum is 33.

The square root of 686733 is about 828.6935501137. The cubic root of 686733 is about 88.2258746285.

The spelling of 686733 in words is "six hundred eighty-six thousand, seven hundred thirty-three".