289666 has 12 divisors (see below), whose sum is σ = 471042. Its totient is φ = 133536.

The previous prime is 289657. The next prime is 289669. The reversal of 289666 is 666982.

It can be written as a sum of positive squares in 3 ways, for example, as 216225 + 73441 = 465^2 + 271^2 .

It is not an unprimeable number, because it can be changed into a prime (289669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 91 + ... + 766.

2²⁸⁹⁶⁶⁶ is an apocalyptic number.

289666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

289666 is a deficient number, since it is larger than the sum of its proper divisors (181376).

289666 is a wasteful number, since it uses less digits than its factorization.

289666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885 (or 872 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The square root of 289666 is about 538.2062801566. The cubic root of 289666 is about 66.1656384381.

The spelling of 289666 in words is "two hundred eighty-nine thousand, six hundred sixty-six".