1668946 has 8 divisors (see below), whose sum is σ = 2564604. Its totient is φ = 814080.

The previous prime is 1668943. The next prime is 1668971. The reversal of 1668946 is 6498661.

It can be written as a sum of positive squares in 2 ways, for example, as 1476225 + 192721 = 1215^2 + 439^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1668899 and 1668908.

It is not an unprimeable number, because it can be changed into a prime (1668943) 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, 10095 + ... + 10258.

2^1668946 is an apocalyptic number.

1668946 is a deficient number, since it is larger than the sum of its proper divisors (895658).

1668946 is a wasteful number, since it uses less digits than its factorization.

1668946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20396.

The product of its digits is 62208, while the sum is 40.

The square root of 1668946 is about 1291.8769291229. The cubic root of 1668946 is about 118.6171344991.

The spelling of 1668946 in words is "one million, six hundred sixty-eight thousand, nine hundred forty-six".