1287143 has 8 divisors (see below), whose sum is σ = 1512336. Its totient is φ = 1080000.

The previous prime is 1287133. The next prime is 1287157. The reversal of 1287143 is 3417821.

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

It is a cyclic number.

It is not a de Polignac number, because 1287143 - 2¹⁰ = 1286119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287133) 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, 4358 + ... + 4643.

It is an arithmetic number, because the mean of its divisors is an integer number (189042).

2^1287143 is an apocalyptic number.

1287143 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1287143 is a deficient number, since it is larger than the sum of its proper divisors (225193).

1287143 is a wasteful number, since it uses less digits than its factorization.

1287143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9025.

The product of its digits is 1344, while the sum is 26.

The square root of 1287143 is about 1134.5232478887. The cubic root of 1287143 is about 108.7782997649.

It can be divided in two parts, 1287 and 143, that multiplied together give a square (184041 = 429²).

The spelling of 1287143 in words is "one million, two hundred eighty-seven thousand, one hundred forty-three".