1663104 has 64 divisors (see below), whose sum is σ = 4553280. Its totient is φ = 537600.

The previous prime is 1663099. The next prime is 1663117. The reversal of 1663104 is 4013661.

Added to its reverse (4013661) it gives a triangular number (5676765 = T₃₃₆₉).

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23389 + ... + 23459.

It is an arithmetic number, because the mean of its divisors is an integer number (71145).

2^1663104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1663104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2276640).

1663104 is an abundant number, since it is smaller than the sum of its proper divisors (2890176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1663104 is an equidigital number, since it uses as much as digits as its factorization.

1663104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1663104 is about 1289.6138957068. The cubic root of 1663104 is about 118.4785697151.

Adding to 1663104 its reverse (4013661), we get a palindrome (5676765).

The spelling of 1663104 in words is "one million, six hundred sixty-three thousand, one hundred four".