1668736 has 16 divisors (see below), whose sum is σ = 3324690. Its totient is φ = 834304.

The previous prime is 1668727. The next prime is 1668739. The reversal of 1668736 is 6378661.

It can be written as a sum of positive squares in only one way, i.e., 1308736 + 360000 = 1144^2 + 600^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a junction number, because it is equal to n+sod(n) for n = 1668695 and 1668704.

It is not an unprimeable number, because it can be changed into a prime (1668739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6391 + ... + 6646.

2^1668736 is an apocalyptic number.

1668736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1668736 is a deficient number, since it is larger than the sum of its proper divisors (1655954).

1668736 is an equidigital number, since it uses as much as digits as its factorization.

1668736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13051 (or 13039 counting only the distinct ones).

The product of its digits is 36288, while the sum is 37.

The square root of 1668736 is about 1291.7956494740. The cubic root of 1668736 is about 118.6121591747.

The spelling of 1668736 in words is "one million, six hundred sixty-eight thousand, seven hundred thirty-six".