1663804 has 6 divisors (see below), whose sum is σ = 2911664. Its totient is φ = 831900.

The previous prime is 1663793. The next prime is 1663813. The reversal of 1663804 is 4083661.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 207972 + ... + 207979.

2^1663804 is an apocalyptic number.

It is an amenable number.

1663804 is a deficient number, since it is larger than the sum of its proper divisors (1247860).

1663804 is a wasteful number, since it uses less digits than its factorization.

1663804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415955 (or 415953 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1663804 is about 1289.8852662156. The cubic root of 1663804 is about 118.4951899156.

The spelling of 1663804 in words is "one million, six hundred sixty-three thousand, eight hundred four".