1166605 has 8 divisors (see below), whose sum is σ = 1527264. Its totient is φ = 848400.

The previous prime is 1166603. The next prime is 1166609. The reversal of 1166605 is 5066611.

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

It is not a de Polignac number, because 1166605 - 2¹ = 1166603 is a prime.

It is a Duffinian number.

1166605 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1166605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10551 + ... + 10660.

It is an arithmetic number, because the mean of its divisors is an integer number (190908).

2^1166605 is an apocalyptic number.

It is an amenable number.

1166605 is a deficient number, since it is larger than the sum of its proper divisors (360659).

1166605 is a wasteful number, since it uses less digits than its factorization.

1166605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21227.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1166605 is about 1080.0949032377. The cubic root of 1166605 is about 105.2708051242.

It can be divided in two parts, 1166 and 605, that added together give a palindrome (1771).

The spelling of 1166605 in words is "one million, one hundred sixty-six thousand, six hundred five".