1287385 has 16 divisors (see below), whose sum is σ = 1710720. Its totient is φ = 922240.

The previous prime is 1287373. The next prime is 1287401. The reversal of 1287385 is 5837821.

It is not a de Polignac number, because 1287385 - 2⁵ = 1287353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1287385.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4764 + ... + 5026.

It is an arithmetic number, because the mean of its divisors is an integer number (106920).

2^1287385 is an apocalyptic number.

It is an amenable number.

1287385 is a deficient number, since it is larger than the sum of its proper divisors (423335).

1287385 is a wasteful number, since it uses less digits than its factorization.

1287385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368.

The product of its digits is 13440, while the sum is 34.

The square root of 1287385 is about 1134.6298956047. The cubic root of 1287385 is about 108.7851165934.

The spelling of 1287385 in words is "one million, two hundred eighty-seven thousand, three hundred eighty-five".