1206605 has 4 divisors (see below), whose sum is σ = 1447932. Its totient is φ = 965280.

The previous prime is 1206587. The next prime is 1206619. The reversal of 1206605 is 5066021.

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 228484 + 978121 = 478^2 + 989^2 .

It is not a de Polignac number, because 1206605 - 2²⁰ = 158029 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent 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, 120656 + ... + 120665.

It is an arithmetic number, because the mean of its divisors is an integer number (361983).

2^1206605 is an apocalyptic number.

It is an amenable number.

1206605 is a deficient number, since it is larger than the sum of its proper divisors (241327).

1206605 is an equidigital number, since it uses as much as digits as its factorization.

1206605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241326.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1206605 is about 1098.4557342014. The cubic root of 1206605 is about 106.4604686245.

The spelling of 1206605 in words is "one million, two hundred six thousand, six hundred five".