1206665 has 4 divisors (see below), whose sum is σ = 1448004. Its totient is φ = 965328.

The previous prime is 1206637. The next prime is 1206679. The reversal of 1206665 is 5666021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 573049 + 633616 = 757^2 + 796^2 .

It is a cyclic number.

It is not a de Polignac number, because 1206665 - 2¹² = 1202569 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120662 + ... + 120671.

It is an arithmetic number, because the mean of its divisors is an integer number (362001).

2^1206665 is an apocalyptic number.

It is an amenable number.

1206665 is a deficient number, since it is larger than the sum of its proper divisors (241339).

1206665 is an equidigital number, since it uses as much as digits as its factorization.

1206665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241338.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 1206665 is about 1098.4830449306. The cubic root of 1206665 is about 106.4622332236.

The spelling of 1206665 in words is "one million, two hundred six thousand, six hundred sixty-five".