1304287 has 4 divisors (see below), whose sum is σ = 1339576. Its totient is φ = 1269000.

The previous prime is 1304273. The next prime is 1304299. The reversal of 1304287 is 7824031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7824031 = 1567 ⋅4993.

It is a cyclic number.

It is not a de Polignac number, because 1304287 - 2¹¹ = 1302239 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1304207) 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, 17589 + ... + 17662.

It is an arithmetic number, because the mean of its divisors is an integer number (334894).

2^1304287 is an apocalyptic number.

1304287 is a deficient number, since it is larger than the sum of its proper divisors (35289).

1304287 is an equidigital number, since it uses as much as digits as its factorization.

1304287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35288.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 1304287 is about 1142.0538516200. The cubic root of 1304287 is about 109.2591259371.

The spelling of 1304287 in words is "one million, three hundred four thousand, two hundred eighty-seven".