1668244 has 12 divisors (see below), whose sum is σ = 3091284. Its totient is φ = 785024.

The previous prime is 1668241. The next prime is 1668253. The reversal of 1668244 is 4428661.

It can be written as a sum of positive squares in 2 ways, for example, as 544644 + 1123600 = 738^2 + 1060^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668241) 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, 12199 + ... + 12334.

It is an arithmetic number, because the mean of its divisors is an integer number (257607).

2^1668244 is an apocalyptic number.

It is an amenable number.

1668244 is a deficient number, since it is larger than the sum of its proper divisors (1423040).

1668244 is a wasteful number, since it uses less digits than its factorization.

1668244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24554 (or 24552 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 1668244 is about 1291.6052028387. The cubic root of 1668244 is about 118.6005010657.

The spelling of 1668244 in words is "one million, six hundred sixty-eight thousand, two hundred forty-four".