1663306 has 4 divisors (see below), whose sum is σ = 2494962. Its totient is φ = 831652.

The previous prime is 1663303. The next prime is 1663309. The reversal of 1663306 is 6033661.

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

It is an interprime number because it is at equal distance from previous prime (1663303) and next prime (1663309).

It can be written as a sum of positive squares in only one way, i.e., 1404225 + 259081 = 1185^2 + 509^2 .

It is not an unprimeable number, because it can be changed into a prime (1663301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415825 + ... + 415828.

2^1663306 is an apocalyptic number.

1663306 is a deficient number, since it is larger than the sum of its proper divisors (831656).

1663306 is an equidigital number, since it uses as much as digits as its factorization.

1663306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831655.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 1663306 is about 1289.6922113435. The cubic root of 1663306 is about 118.4833663087.

Adding to 1663306 its reverse (6033661), we get a palindrome (7696967).

The spelling of 1663306 in words is "one million, six hundred sixty-three thousand, three hundred six".