1665045 has 24 divisors (see below), whose sum is σ = 2916576. Its totient is φ = 878688.

The previous prime is 1665043. The next prime is 1665061. The reversal of 1665045 is 5405661.

It is a happy number.

1665045 is a `hidden beast` number, since 1 + 6 + 650 + 4 + 5 = 666.

It is not a de Polignac number, because 1665045 - 2¹ = 1665043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665043) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7222 + ... + 7448.

It is an arithmetic number, because the mean of its divisors is an integer number (121524).

2^1665045 is an apocalyptic number.

1665045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1665045 is a deficient number, since it is larger than the sum of its proper divisors (1251531).

1665045 is a wasteful number, since it uses less digits than its factorization.

1665045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401 (or 398 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 1665045 is about 1290.3662270844. The cubic root of 1665045 is about 118.5246437023.

The spelling of 1665045 in words is "one million, six hundred sixty-five thousand, forty-five".