686941 has 4 divisors (see below), whose sum is σ = 716832. Its totient is φ = 657052.

The previous prime is 686911. The next prime is 686947. The reversal of 686941 is 149686.

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, and also an emirpimes, since its reverse is a distinct semiprime: 149686 = 2 ⋅74843.

It is a cyclic number.

It is not a de Polignac number, because 686941 - 2¹³ = 678749 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 686897 and 686906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14911 + ... + 14956.

It is an arithmetic number, because the mean of its divisors is an integer number (179208).

2⁶⁸⁶⁹⁴¹ is an apocalyptic number.

It is an amenable number.

686941 is a deficient number, since it is larger than the sum of its proper divisors (29891).

686941 is a wasteful number, since it uses less digits than its factorization.

686941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29890.

The product of its digits is 10368, while the sum is 34.

The square root of 686941 is about 828.8190393566. The cubic root of 686941 is about 88.2347811125.

The spelling of 686941 in words is "six hundred eighty-six thousand, nine hundred forty-one".