287409 has 4 divisors (see below), whose sum is σ = 383216. Its totient is φ = 191604.

The previous prime is 287393. The next prime is 287437. The reversal of 287409 is 904782.

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 not a de Polignac number, because 287409 - 2⁴ = 287393 is a prime.

It is a D-number.

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, 47899 + ... + 47904.

It is an arithmetic number, because the mean of its divisors is an integer number (95804).

2²⁸⁷⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

287409 is a deficient number, since it is larger than the sum of its proper divisors (95807).

287409 is an equidigital number, since it uses as much as digits as its factorization.

287409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95806.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 287409 is about 536.1054000847. The cubic root of 287409 is about 65.9933418444.

It can be divided in two parts, 287 and 409, that added together give a palindrome (696).

The spelling of 287409 in words is "two hundred eighty-seven thousand, four hundred nine".