1289666 has 8 divisors (see below), whose sum is σ = 2210880. Its totient is φ = 552708.

The previous prime is 1289657. The next prime is 1289677. The reversal of 1289666 is 6669821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

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 3 ways as a sum of consecutive naturals, for example, 46046 + ... + 46073.

It is an arithmetic number, because the mean of its divisors is an integer number (276360).

2^1289666 is an apocalyptic number.

1289666 is a deficient number, since it is larger than the sum of its proper divisors (921214).

1289666 is an equidigital number, since it uses as much as digits as its factorization.

1289666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92128.

The product of its digits is 31104, while the sum is 38.

The square root of 1289666 is about 1135.6346243401. The cubic root of 1289666 is about 108.8493274921.

The spelling of 1289666 in words is "one million, two hundred eighty-nine thousand, six hundred sixty-six".