1663968 has 24 divisors (see below), whose sum is σ = 4368168. Its totient is φ = 554624.

The previous prime is 1663967. The next prime is 1663973. The reversal of 1663968 is 8693661.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663967) 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, 8571 + ... + 8762.

It is an arithmetic number, because the mean of its divisors is an integer number (182007).

2^1663968 is an apocalyptic number.

It is an amenable number.

1663968 is an abundant number, since it is smaller than the sum of its proper divisors (2704200).

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

1663968 is a wasteful number, since it uses less digits than its factorization.

1663968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17346 (or 17338 counting only the distinct ones).

The product of its digits is 46656, while the sum is 39.

The square root of 1663968 is about 1289.9488361947. The cubic root of 1663968 is about 118.4990831170.

The spelling of 1663968 in words is "one million, six hundred sixty-three thousand, nine hundred sixty-eight".