1266816 has 32 divisors (see below), whose sum is σ = 3366000. Its totient is φ = 422144.

The previous prime is 1266799. The next prime is 1266841. The reversal of 1266816 is 6186621.

It is a tau number, because it is divible by the number of its divisors (32).

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

It is an unprimeable number.

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, 1266 + ... + 2033.

2^1266816 is an apocalyptic number.

1266816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1266816 is an abundant number, since it is smaller than the sum of its proper divisors (2099184).

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

1266816 is an equidigital number, since it uses as much as digits as its factorization.

1266816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3316 (or 3304 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 1266816 is about 1125.5292088613. The cubic root of 1266816 is about 108.2026373920.

The spelling of 1266816 in words is "one million, two hundred sixty-six thousand, eight hundred sixteen".