289997 has 4 divisors (see below), whose sum is σ = 305280. Its totient is φ = 274716.

The previous prime is 289987. The next prime is 289999. The reversal of 289997 is 799982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 289997 - 2⁸ = 289741 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7613 + ... + 7650.

It is an arithmetic number, because the mean of its divisors is an integer number (76320).

2²⁸⁹⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

289997 is a deficient number, since it is larger than the sum of its proper divisors (15283).

289997 is a wasteful number, since it uses less digits than its factorization.

289997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15282.

The product of its digits is 81648, while the sum is 44.

The square root of 289997 is about 538.5136952762. The cubic root of 289997 is about 66.1908312344.

The spelling of 289997 in words is "two hundred eighty-nine thousand, nine hundred ninety-seven".