1665065 has 16 divisors (see below), whose sum is σ = 2229120. Its totient is φ = 1186560.

The previous prime is 1665061. The next prime is 1665067. The reversal of 1665065 is 5605661.

It is not a de Polignac number, because 1665065 - 2² = 1665061 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1665061) 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, 1100 + ... + 2130.

It is an arithmetic number, because the mean of its divisors is an integer number (139320).

2^1665065 is an apocalyptic number.

It is an amenable number.

1665065 is a deficient number, since it is larger than the sum of its proper divisors (564055).

1665065 is a wasteful number, since it uses less digits than its factorization.

1665065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 1665065 is about 1290.3739767990. The cubic root of 1665065 is about 118.5251182607.

The spelling of 1665065 in words is "one million, six hundred sixty-five thousand, sixty-five".