1287847 has 12 divisors (see below), whose sum is σ = 1462536. Its totient is φ = 1124240.

The previous prime is 1287841. The next prime is 1287857. The reversal of 1287847 is 7487821.

It is not a de Polignac number, because 1287847 - 2¹¹ = 1285799 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24273 + ... + 24325.

It is an arithmetic number, because the mean of its divisors is an integer number (121878).

2^1287847 is an apocalyptic number.

1287847 is a deficient number, since it is larger than the sum of its proper divisors (174689).

1287847 is an equidigital number, since it uses as much as digits as its factorization.

1287847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 111 counting only the distinct ones).

The product of its digits is 25088, while the sum is 37.

The square root of 1287847 is about 1134.8334679591. The cubic root of 1287847 is about 108.7981281667.

The spelling of 1287847 in words is "one million, two hundred eighty-seven thousand, eight hundred forty-seven".