1287656 has 16 divisors (see below), whose sum is σ = 2449440. Its totient is φ = 634480.

The previous prime is 1287623. The next prime is 1287661. The reversal of 1287656 is 6567821.

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 3 ways as a sum of consecutive naturals, for example, 566 + ... + 1701.

It is an arithmetic number, because the mean of its divisors is an integer number (153090).

2^1287656 is an apocalyptic number.

It is an amenable number.

1287656 is a deficient number, since it is larger than the sum of its proper divisors (1161784).

1287656 is a wasteful number, since it uses less digits than its factorization.

1287656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2344 (or 2340 counting only the distinct ones).

The product of its digits is 20160, while the sum is 35.

The square root of 1287656 is about 1134.7493115222. The cubic root of 1287656 is about 108.7927493005.

The spelling of 1287656 in words is "one million, two hundred eighty-seven thousand, six hundred fifty-six".