1666044 has 18 divisors (see below), whose sum is σ = 4211480.
Its totient is φ = 555336.
The previous prime is 1666043. The next prime is 1666061. The reversal of 1666044 is 4406661.
It is a tau number, because it is divible by the number of its divisors (18).
It is a junction number, because it is equal to n+sod(n) for n = 1665999 and 1666017.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1666043) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23104 + ... + 23175.
21666044 is an apocalyptic number.
It is an amenable number.
1666044 is an abundant number, since it is smaller than the sum of its proper divisors (2545436).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1666044 is a wasteful number, since it uses less digits than its factorization.
1666044 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 46289 (or 46284 counting only the distinct ones).
The product of its (nonzero) digits is 3456, while the sum is 27.
The square root of 1666044 is about 1290.7532684444.
The cubic root of 1666044 is about 118.5483432512.
The spelling of 1666044 in words is "one million, six hundred sixty-six thousand, forty-four".