1665133 has 8 divisors (see below), whose sum is σ = 1806840.
Its totient is φ = 1528320.
The previous prime is 1665121. The next prime is 1665137. The reversal of 1665133 is 3315661.
It can be written as a sum of positive squares in 4 ways, for example, as 21609 + 1643524 = 147^2 + 1282^2
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 1665133 - 217 = 1534061 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 1665098 and 1665107.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1665137) 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, 498 + ... + 1891.
It is an arithmetic number, because the mean of its divisors is an integer number (225855).
21665133 is an apocalyptic number.
It is an amenable number.
1665133 is a deficient number, since it is larger than the sum of its proper divisors (141707).
1665133 is a wasteful number, since it uses less digits than its factorization.
1665133 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2447.
The product of its digits is 1620, while the sum is 25.
The square root of 1665133 is about 1290.4003254804.
The cubic root of 1665133 is about 118.5267317309.
It can be divided in two parts, 1665 and 133, that multiplied together give a triangular number (221445 = T665).
The spelling of 1665133 in words is "one million, six hundred sixty-five thousand, one hundred thirty-three".