1665489 has 8 divisors (see below), whose sum is σ = 2537920. Its totient is φ = 951696.

The previous prime is 1665479. The next prime is 1665493. The reversal of 1665489 is 9845661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1665489 - 2⁸ = 1665233 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1665479) 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 7 ways as a sum of consecutive naturals, for example, 39634 + ... + 39675.

It is an arithmetic number, because the mean of its divisors is an integer number (317240).

2^1665489 is an apocalyptic number.

It is an amenable number.

1665489 is a deficient number, since it is larger than the sum of its proper divisors (872431).

1665489 is an equidigital number, since it uses as much as digits as its factorization.

1665489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79319.

The product of its digits is 51840, while the sum is 39.

The square root of 1665489 is about 1290.5382597971. The cubic root of 1665489 is about 118.5351780051.

The spelling of 1665489 in words is "one million, six hundred sixty-five thousand, four hundred eighty-nine".