1305666 has 16 divisors (see below), whose sum is σ = 2901600. Its totient is φ = 435204.

The previous prime is 1305659. The next prime is 1305679. The reversal of 1305666 is 6665031.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12036 + ... + 12143.

It is an arithmetic number, because the mean of its divisors is an integer number (181350).

2^1305666 is an apocalyptic number.

1305666 is an abundant number, since it is smaller than the sum of its proper divisors (1595934).

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

1305666 is a wasteful number, since it uses less digits than its factorization.

1305666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24190 (or 24184 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 1305666 is about 1142.6574289786. The cubic root of 1305666 is about 109.2976183002.

The spelling of 1305666 in words is "one million, three hundred five thousand, six hundred sixty-six".