1286664 has 16 divisors (see below), whose sum is σ = 3216720. Its totient is φ = 428880.

The previous prime is 1286657. The next prime is 1286669. The reversal of 1286664 is 4666821.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1286669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26782 + ... + 26829.

It is an arithmetic number, because the mean of its divisors is an integer number (201045).

2^1286664 is an apocalyptic number.

It is an amenable number.

1286664 is an abundant number, since it is smaller than the sum of its proper divisors (1930056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1286664 is a wasteful number, since it uses less digits than its factorization.

1286664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53620 (or 53616 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 1286664 is about 1134.3121263568. The cubic root of 1286664 is about 108.7648044319.

The spelling of 1286664 in words is "one million, two hundred eighty-six thousand, six hundred sixty-four".