1665359 has 4 divisors (see below), whose sum is σ = 1677480. Its totient is φ = 1653240.

The previous prime is 1665343. The next prime is 1665421. The reversal of 1665359 is 9535661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1665359 - 2⁴ = 1665343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5852 + ... + 6129.

It is an arithmetic number, because the mean of its divisors is an integer number (419370).

2^1665359 is an apocalyptic number.

1665359 is a deficient number, since it is larger than the sum of its proper divisors (12121).

1665359 is a wasteful number, since it uses less digits than its factorization.

1665359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12120.

The product of its digits is 24300, while the sum is 35.

The square root of 1665359 is about 1290.4878922330. The cubic root of 1665359 is about 118.5320938310.

The spelling of 1665359 in words is "one million, six hundred sixty-five thousand, three hundred fifty-nine".