1266660 has 72 divisors (see below), whose sum is σ = 3983616. Its totient is φ = 325440.

The previous prime is 1266631. The next prime is 1266677. The reversal of 1266660 is 666621.

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 23 ways as a sum of consecutive naturals, for example, 5467 + ... + 5693.

It is an arithmetic number, because the mean of its divisors is an integer number (55328).

2^1266660 is an apocalyptic number.

1266660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1266660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1991808).

1266660 is an abundant number, since it is smaller than the sum of its proper divisors (2716956).

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

1266660 is a wasteful number, since it uses less digits than its factorization.

1266660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 1266660 is about 1125.4599059940. The cubic root of 1266660 is about 108.1981957303.

It can be divided in two parts, 126 and 6660, that multiplied together give a triangular number (839160 = T₁₂₉₅).

The spelling of 1266660 in words is "one million, two hundred sixty-six thousand, six hundred sixty".