1665845 has 8 divisors (see below), whose sum is σ = 2009760. Its totient is φ = 1325520.

The previous prime is 1665841. The next prime is 1665869. The reversal of 1665845 is 5485661.

It is a happy number.

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

It is not a de Polignac number, because 1665845 - 2² = 1665841 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266 + ... + 1844.

It is an arithmetic number, because the mean of its divisors is an integer number (251220).

2^1665845 is an apocalyptic number.

It is an amenable number.

1665845 is a deficient number, since it is larger than the sum of its proper divisors (343915).

1665845 is a wasteful number, since it uses less digits than its factorization.

1665845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795.

The product of its digits is 28800, while the sum is 35.

The square root of 1665845 is about 1290.6761793727. The cubic root of 1665845 is about 118.5436230758.

The spelling of 1665845 in words is "one million, six hundred sixty-five thousand, eight hundred forty-five".