287489 has 4 divisors (see below), whose sum is σ = 302640. Its totient is φ = 272340.

The previous prime is 287449. The next prime is 287491. The reversal of 287489 is 984782.

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 287489 - 2⁸ = 287233 is a prime.

It is a super-3 number, since 3×287489³ = 71282832969333507, which contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (287449) 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, 7547 + ... + 7584.

It is an arithmetic number, because the mean of its divisors is an integer number (75660).

2²⁸⁷⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

287489 is a deficient number, since it is larger than the sum of its proper divisors (15151).

287489 is a wasteful number, since it uses less digits than its factorization.

287489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15150.

The product of its digits is 32256, while the sum is 38.

The square root of 287489 is about 536.1800070872. The cubic root of 287489 is about 65.9994643360. Note that the first 3 decimals are identical.

The spelling of 287489 in words is "two hundred eighty-seven thousand, four hundred eighty-nine".