1665265 has 16 divisors (see below), whose sum is σ = 2332800. Its totient is φ = 1140720.

The previous prime is 1665263. The next prime is 1665271. The reversal of 1665265 is 5625661.

It is not a de Polignac number, because 1665265 - 2¹ = 1665263 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1665263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1230 + ... + 2200.

It is an arithmetic number, because the mean of its divisors is an integer number (145800).

2^1665265 is an apocalyptic number.

It is an amenable number.

1665265 is a deficient number, since it is larger than the sum of its proper divisors (667535).

1665265 is an frugal number, since it uses more digits than its factorization.

1665265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997 (or 983 counting only the distinct ones).

The product of its digits is 10800, while the sum is 31.

The square root of 1665265 is about 1290.4514713851. The cubic root of 1665265 is about 118.5298636359.

The spelling of 1665265 in words is "one million, six hundred sixty-five thousand, two hundred sixty-five".