686049 has 24 divisors (see below), whose sum is σ = 1149120. Its totient is φ = 360864.

The previous prime is 686041. The next prime is 686051. The reversal of 686049 is 940686.

It is not a de Polignac number, because 686049 - 2³ = 686041 is a prime.

686049 is a lucky number.

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (686041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1732 + ... + 2090.

It is an arithmetic number, because the mean of its divisors is an integer number (47880).

2⁶⁸⁶⁰⁴⁹ is an apocalyptic number.

It is an amenable number.

686049 is a deficient number, since it is larger than the sum of its proper divisors (463071).

686049 is a wasteful number, since it uses less digits than its factorization.

686049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389 (or 382 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 686049 is about 828.2807495047. The cubic root of 686049 is about 88.1965733111.

The spelling of 686049 in words is "six hundred eighty-six thousand, forty-nine".