686949 has 4 divisors (see below), whose sum is σ = 915936. Its totient is φ = 457964.

The previous prime is 686947. The next prime is 686963. The reversal of 686949 is 949686.

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 686949 - 2¹ = 686947 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 686949.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 686949.

It is not an unprimeable number, because it can be changed into a prime (686947) 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, 114489 + ... + 114494.

It is an arithmetic number, because the mean of its divisors is an integer number (228984).

2⁶⁸⁶⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

686949 is a deficient number, since it is larger than the sum of its proper divisors (228987).

686949 is a wasteful number, since it uses less digits than its factorization.

686949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228986.

The product of its digits is 93312, while the sum is 42.

The square root of 686949 is about 828.8238654865. The cubic root of 686949 is about 88.2351236337.

The spelling of 686949 in words is "six hundred eighty-six thousand, nine hundred forty-nine".