1668868 has 6 divisors (see below), whose sum is σ = 2920526. Its totient is φ = 834432.

The previous prime is 1668847. The next prime is 1668869. The reversal of 1668868 is 8688661.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1420864 + 248004 = 1192^2 + 498^2 .

It is not an unprimeable number, because it can be changed into a prime (1668869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 208605 + ... + 208612.

2^1668868 is an apocalyptic number.

It is an amenable number.

1668868 is a deficient number, since it is larger than the sum of its proper divisors (1251658).

1668868 is a wasteful number, since it uses less digits than its factorization.

1668868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417221 (or 417219 counting only the distinct ones).

The product of its digits is 110592, while the sum is 43.

The square root of 1668868 is about 1291.8467401360. The cubic root of 1668868 is about 118.6152865702.

The spelling of 1668868 in words is "one million, six hundred sixty-eight thousand, eight hundred sixty-eight".