1287655 has 8 divisors (see below), whose sum is σ = 1612512. Its totient is φ = 985248.

The previous prime is 1287623. The next prime is 1287661. The reversal of 1287655 is 5567821.

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 1287655 - 2⁵ = 1287623 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 6.

It is a self number, because there is not a number n which added to its sum of digits gives 1287655.

It is a congruent number.

It is an unprimeable number.

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, 5484 + ... + 5713.

It is an arithmetic number, because the mean of its divisors is an integer number (201564).

2^1287655 is an apocalyptic number.

1287655 is a deficient number, since it is larger than the sum of its proper divisors (324857).

1287655 is a wasteful number, since it uses less digits than its factorization.

1287655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11225.

The product of its digits is 16800, while the sum is 34.

The square root of 1287655 is about 1134.7488708961. The cubic root of 1287655 is about 108.7927211375.

The spelling of 1287655 in words is "one million, two hundred eighty-seven thousand, six hundred fifty-five".