1663120 has 20 divisors (see below), whose sum is σ = 3866940. Its totient is φ = 665216.

The previous prime is 1663117. The next prime is 1663133. The reversal of 1663120 is 213661.

1663120 is nontrivially palindromic in base 3.

It can be written as a sum of positive squares in 2 ways, for example, as 1073296 + 589824 = 1036^2 + 768^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10315 + ... + 10474.

It is an arithmetic number, because the mean of its divisors is an integer number (193347).

2^1663120 is an apocalyptic number.

1663120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1663120 is an abundant number, since it is smaller than the sum of its proper divisors (2203820).

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

1663120 is a wasteful number, since it uses less digits than its factorization.

1663120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20802 (or 20796 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1663120 is about 1289.6200990990. The cubic root of 1663120 is about 118.4789496574.

Adding to 1663120 its reverse (213661), we get a palindrome (1876781).

It can be divided in two parts, 16 and 63120, that added together give a palindrome (63136).

The spelling of 1663120 in words is "one million, six hundred sixty-three thousand, one hundred twenty".