1666446 has 8 divisors (see below), whose sum is σ = 3332904. Its totient is φ = 555480.

The previous prime is 1666429. The next prime is 1666447. The reversal of 1666446 is 6446661.

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

1666446 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666447) 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, 138865 + ... + 138876.

It is an arithmetic number, because the mean of its divisors is an integer number (416613).

2^1666446 is an apocalyptic number.

1666446 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1666446 is a wasteful number, since it uses less digits than its factorization.

1666446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277746.

The product of its digits is 20736, while the sum is 33.

The square root of 1666446 is about 1290.9089820743. The cubic root of 1666446 is about 118.5578773335.

It can be divided in two parts, 1666 and 446, that added together give a palindrome (2112).

The spelling of 1666446 in words is "one million, six hundred sixty-six thousand, four hundred forty-six".