1165605 has 32 divisors (see below), whose sum is σ = 2260224. Its totient is φ = 500736.

The previous prime is 1165583. The next prime is 1165643. The reversal of 1165605 is 5065611.

It is not a de Polignac number, because 1165605 - 2⁸ = 1165349 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1459 + ... + 2111.

It is an arithmetic number, because the mean of its divisors is an integer number (70632).

2^1165605 is an apocalyptic number.

1165605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1165605 is a deficient number, since it is larger than the sum of its proper divisors (1094619).

1165605 is a wasteful number, since it uses less digits than its factorization.

1165605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 1165605 is about 1079.6318817078. The cubic root of 1165605 is about 105.2407175629.

It can be divided in two parts, 1165 and 605, that added together give a triangular number (1770 = T₅₉).

The spelling of 1165605 in words is "one million, one hundred sixty-five thousand, six hundred five".