287447 has 4 divisors (see below), whose sum is σ = 288960. Its totient is φ = 285936.

The previous prime is 287437. The next prime is 287449. The reversal of 287447 is 744782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 287447 - 2⁶ = 287383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 287447.

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, 422 + ... + 867.

It is an arithmetic number, because the mean of its divisors is an integer number (72240).

2²⁸⁷⁴⁴⁷ is an apocalyptic number.

287447 is a deficient number, since it is larger than the sum of its proper divisors (1513).

287447 is a wasteful number, since it uses less digits than its factorization.

287447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512.

The product of its digits is 12544, while the sum is 32.

The square root of 287447 is about 536.1408397054. The cubic root of 287447 is about 65.9962501696.

The spelling of 287447 in words is "two hundred eighty-seven thousand, four hundred forty-seven".