1605165 has 16 divisors (see below), whose sum is σ = 2593728. Its totient is φ = 847616.

The previous prime is 1605151. The next prime is 1605169. The reversal of 1605165 is 5615061.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1605165 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1222 + ... + 2168.

It is an arithmetic number, because the mean of its divisors is an integer number (162108).

2^1605165 is an apocalyptic number.

1605165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1605165 is a deficient number, since it is larger than the sum of its proper divisors (988563).

1605165 is a wasteful number, since it uses less digits than its factorization.

1605165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068.

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

The square root of 1605165 is about 1266.9510645641. The cubic root of 1605165 is about 117.0864289429.

It can be divided in two parts, 1605 and 165, that added together give a triangular number (1770 = T₅₉).

The spelling of 1605165 in words is "one million, six hundred five thousand, one hundred sixty-five".