1669966 has 4 divisors (see below), whose sum is σ = 2504952. Its totient is φ = 834982.

The previous prime is 1669963. The next prime is 1669979. The reversal of 1669966 is 6699661.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 417490 + ... + 417493.

It is an arithmetic number, because the mean of its divisors is an integer number (626238).

2^1669966 is an apocalyptic number.

1669966 is a deficient number, since it is larger than the sum of its proper divisors (834986).

1669966 is an equidigital number, since it uses as much as digits as its factorization.

1669966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834985.

The product of its digits is 104976, while the sum is 43.

The square root of 1669966 is about 1292.2716432701. The cubic root of 1669966 is about 118.6412944254.

The spelling of 1669966 in words is "one million, six hundred sixty-nine thousand, nine hundred sixty-six".