1166805 has 40 divisors (see below), whose sum is σ = 2172192. Its totient is φ = 598752.

The previous prime is 1166801. The next prime is 1166807. The reversal of 1166805 is 5086611.

Added to its reverse (5086611) it gives a triangular number (6253416 = T₃₅₃₆).

It is not a de Polignac number, because 1166805 - 2² = 1166801 is a prime.

It is a super-2 number, since 2×1166805² = 2722867816050, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166801) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 17382 + ... + 17448.

2^1166805 is an apocalyptic number.

1166805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1166805 is a deficient number, since it is larger than the sum of its proper divisors (1005387).

1166805 is an equidigital number, since it uses as much as digits as its factorization.

1166805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1166805 is about 1080.1874837268. The cubic root of 1166805 is about 105.2768205731.

Adding to 1166805 its reverse (5086611), we get a triangular number (6253416 = T₃₅₃₆).

The spelling of 1166805 in words is "one million, one hundred sixty-six thousand, eight hundred five".