1665441 has 20 divisors (see below), whose sum is σ = 2577300. Its totient is φ = 1070496.

The previous prime is 1665437. The next prime is 1665451. The reversal of 1665441 is 1445661.

1665441 is a `hidden beast` number, since 1 + 6 + 654 + 4 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 518400 + 1147041 = 720^2 + 1071^2 .

It is not a de Polignac number, because 1665441 - 2² = 1665437 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1665421) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1995 + ... + 2703.

It is an arithmetic number, because the mean of its divisors is an integer number (128865).

2^1665441 is an apocalyptic number.

It is an amenable number.

1665441 is a deficient number, since it is larger than the sum of its proper divisors (911859).

1665441 is an equidigital number, since it uses as much as digits as its factorization.

1665441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750 (or 741 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 1665441 is about 1290.5196627716. The cubic root of 1665441 is about 118.5340392519.

The spelling of 1665441 in words is "one million, six hundred sixty-five thousand, four hundred forty-one".