1663684 has 12 divisors (see below), whose sum is σ = 3176208. Its totient is φ = 756200.

The previous prime is 1663681. The next prime is 1663687. The reversal of 1663684 is 4863661.

It is an interprime number because it is at equal distance from previous prime (1663681) and next prime (1663687).

It is not an unprimeable number, because it can be changed into a prime (1663681) 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, 18862 + ... + 18949.

It is an arithmetic number, because the mean of its divisors is an integer number (264684).

2^1663684 is an apocalyptic number.

It is an amenable number.

1663684 is a deficient number, since it is larger than the sum of its proper divisors (1512524).

1663684 is a wasteful number, since it uses less digits than its factorization.

1663684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37826 (or 37824 counting only the distinct ones).

The product of its digits is 20736, while the sum is 34.

The square root of 1663684 is about 1289.8387496117. The cubic root of 1663684 is about 118.4923410694.

The spelling of 1663684 in words is "one million, six hundred sixty-three thousand, six hundred eighty-four".