1666946 has 8 divisors (see below), whose sum is σ = 2632080. Its totient is φ = 789588.

The previous prime is 1666943. The next prime is 1666991. The reversal of 1666946 is 6496661.

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

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 43867 = 1666946 / (1 + 6 + 6 + 6 + 9 + 4 + 6).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1666943) 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 3 ways as a sum of consecutive naturals, for example, 21896 + ... + 21971.

It is an arithmetic number, because the mean of its divisors is an integer number (329010).

2^1666946 is an apocalyptic number.

1666946 is a deficient number, since it is larger than the sum of its proper divisors (965134).

1666946 is a wasteful number, since it uses less digits than its factorization.

1666946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43888.

The product of its digits is 46656, while the sum is 38.

The square root of 1666946 is about 1291.1026295380. The cubic root of 1666946 is about 118.5697335054.

The spelling of 1666946 in words is "one million, six hundred sixty-six thousand, nine hundred forty-six".