1287668 has 12 divisors (see below), whose sum is σ = 2372160. Its totient is φ = 609912.

The previous prime is 1287661. The next prime is 1287683. The reversal of 1287668 is 8667821.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8396 + ... + 8547.

It is an arithmetic number, because the mean of its divisors is an integer number (197680).

2^1287668 is an apocalyptic number.

It is an amenable number.

1287668 is a deficient number, since it is larger than the sum of its proper divisors (1084492).

1287668 is a wasteful number, since it uses less digits than its factorization.

1287668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16966 (or 16964 counting only the distinct ones).

The product of its digits is 32256, while the sum is 38.

The square root of 1287668 is about 1134.7545990213. The cubic root of 1287668 is about 108.7930872554.

The spelling of 1287668 in words is "one million, two hundred eighty-seven thousand, six hundred sixty-eight".