689986 has 16 divisors (see below), whose sum is σ = 1146240.
Its totient is φ = 308880.
The previous prime is 689981. The next prime is 689987.
It is a happy number.
689986 is nontrivially palindromic in base 10.
It is a nialpdrome in base 16.
It is not an unprimeable number, because it can be changed into a prime (689981) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1540 + ... + 1936.
It is an arithmetic number, because the mean of its divisors is an integer number (71640).
2689986 is an apocalyptic number.
689986 is a deficient number, since it is larger than the sum of its proper divisors (456254).
689986 is a wasteful number, since it uses less digits than its factorization.
689986 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 489.
The product of its digits is 186624, while the sum is 46.
The square root of 689986 is about 830.6539592393.
The cubic root of 689986 is about 88.3649615785.
The spelling of 689986 in words is "six hundred eighty-nine thousand, nine hundred eighty-six".