1663304 has 16 divisors (see below), whose sum is σ = 3134700. Its totient is φ = 827392.

The previous prime is 1663303. The next prime is 1663309. The reversal of 1663304 is 4033661.

It can be written as a sum of positive squares in 2 ways, for example, as 1214404 + 448900 = 1102^2 + 670^2 .

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1663304.

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 in 3 ways as a sum of consecutive naturals, for example, 1652 + ... + 2460.

2^1663304 is an apocalyptic number.

It is an amenable number.

1663304 is a deficient number, since it is larger than the sum of its proper divisors (1471396).

1663304 is a wasteful number, since it uses less digits than its factorization.

1663304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072 (or 1068 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 1663304 is about 1289.6914359644. The cubic root of 1663304 is about 118.4833188196.

Adding to 1663304 its reverse (4033661), we get a palindrome (5696965).

The spelling of 1663304 in words is "one million, six hundred sixty-three thousand, three hundred four".