1668616 has 8 divisors (see below), whose sum is σ = 3128670. Its totient is φ = 834304.

The previous prime is 1668593. The next prime is 1668617. The reversal of 1668616 is 6168661.

It can be written as a sum of positive squares in only one way, i.e., 1572516 + 96100 = 1254^2 + 310^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1668617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104281 + ... + 104296.

2^1668616 is an apocalyptic number.

It is an amenable number.

1668616 is a deficient number, since it is larger than the sum of its proper divisors (1460054).

1668616 is a wasteful number, since it uses less digits than its factorization.

1668616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208583 (or 208579 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 1668616 is about 1291.7492016642. The cubic root of 1668616 is about 118.6093159448.

The spelling of 1668616 in words is "one million, six hundred sixty-eight thousand, six hundred sixteen".