1663006 has 4 divisors (see below), whose sum is σ = 2494512. Its totient is φ = 831502.

The previous prime is 1662979. The next prime is 1663009. The reversal of 1663006 is 6003661.

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

It is a Smith number, since the sum of its digits (22) 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 (1663009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415750 + ... + 415753.

It is an arithmetic number, because the mean of its divisors is an integer number (623628).

2^1663006 is an apocalyptic number.

1663006 is a deficient number, since it is larger than the sum of its proper divisors (831506).

1663006 is an equidigital number, since it uses as much as digits as its factorization.

1663006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831505.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 1663006 is about 1289.5758992785. The cubic root of 1663006 is about 118.4762425149.

Adding to 1663006 its reverse (6003661), we get a palindrome (7666667).

The spelling of 1663006 in words is "one million, six hundred sixty-three thousand, six".