1287895 has 16 divisors (see below), whose sum is σ = 1824768. Its totient is φ = 853920.

The previous prime is 1287887. The next prime is 1287899. The reversal of 1287895 is 5987821.

It is not a de Polignac number, because 1287895 - 2³ = 1287887 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 (1287899) 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 15 ways as a sum of consecutive naturals, for example, 492 + ... + 1678.

It is an arithmetic number, because the mean of its divisors is an integer number (114048).

2^1287895 is an apocalyptic number.

1287895 is a deficient number, since it is larger than the sum of its proper divisors (536873).

1287895 is a wasteful number, since it uses less digits than its factorization.

1287895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230.

The product of its digits is 40320, while the sum is 40.

The square root of 1287895 is about 1134.8546162395. The cubic root of 1287895 is about 108.7994798400.

The spelling of 1287895 in words is "one million, two hundred eighty-seven thousand, eight hundred ninety-five".