686972 has 24 divisors (see below), whose sum is σ = 1413552. Its totient is φ = 288000.

The previous prime is 686971. The next prime is 686977. The reversal of 686972 is 279686.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686971) 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 7 ways as a sum of consecutive naturals, for example, 29 + ... + 1172.

It is an arithmetic number, because the mean of its divisors is an integer number (58898).

2⁶⁸⁶⁹⁷² is an apocalyptic number.

It is an amenable number.

686972 is an abundant number, since it is smaller than the sum of its proper divisors (726580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686972 is a wasteful number, since it uses less digits than its factorization.

686972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229 (or 1227 counting only the distinct ones).

The product of its digits is 36288, while the sum is 38.

The square root of 686972 is about 828.8377404535. The cubic root of 686972 is about 88.2361083672.

The spelling of 686972 in words is "six hundred eighty-six thousand, nine hundred seventy-two".