1666326 has 16 divisors (see below), whose sum is σ = 3354624. Its totient is φ = 551784.

The previous prime is 1666321. The next prime is 1666339. The reversal of 1666326 is 6236661.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1666293 and 1666302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666321) 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, 171 + ... + 1833.

It is an arithmetic number, because the mean of its divisors is an integer number (209664).

2^1666326 is an apocalyptic number.

1666326 is an abundant number, since it is smaller than the sum of its proper divisors (1688298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1666326 is a wasteful number, since it uses less digits than its factorization.

1666326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1835.

The product of its digits is 7776, while the sum is 30.

The square root of 1666326 is about 1290.8625023603. The cubic root of 1666326 is about 118.5550314993. Note that the first 3 decimals are identical.

The spelling of 1666326 in words is "one million, six hundred sixty-six thousand, three hundred twenty-six".