289666189 has 12 divisors (see below), whose sum is σ = 303871932. Its totient is φ = 275956800.

The previous prime is 289666187. The next prime is 289666243. The reversal of 289666189 is 981666982.

It can be written as a sum of positive squares in 2 ways, for example, as 129846025 + 159820164 = 11395^2 + 12642^2 .

It is not a de Polignac number, because 289666189 - 2¹ = 289666187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289666187) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73899 + ... + 77719.

It is an arithmetic number, because the mean of its divisors is an integer number (25322661).

Almost surely, 2^289666189 is an apocalyptic number.

It is an amenable number.

289666189 is a deficient number, since it is larger than the sum of its proper divisors (14205743).

289666189 is an equidigital number, since it uses as much as digits as its factorization.

289666189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3948 (or 3905 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 55.

The square root of 289666189 is about 17019.5825154438. The cubic root of 289666189 is about 661.6565282860.

The spelling of 289666189 in words is "two hundred eighty-nine million, six hundred sixty-six thousand, one hundred eighty-nine".