1287147 has 8 divisors (see below), whose sum is σ = 1738240. Its totient is φ = 847080.

The previous prime is 1287133. The next prime is 1287157. The reversal of 1287147 is 7417821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1287147 - 2⁴ = 1287131 is a prime.

It is a super-4 number, since 4×1287147⁴ (a number of 26 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2479 + ... + 2952.

It is an arithmetic number, because the mean of its divisors is an integer number (217280).

2^1287147 is an apocalyptic number.

1287147 is a deficient number, since it is larger than the sum of its proper divisors (451093).

1287147 is an equidigital number, since it uses as much as digits as its factorization.

1287147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5513.

The product of its digits is 3136, while the sum is 30.

The square root of 1287147 is about 1134.5250107424. The cubic root of 1287147 is about 108.7784124467.

The spelling of 1287147 in words is "one million, two hundred eighty-seven thousand, one hundred forty-seven".