1668626 has 8 divisors (see below), whose sum is σ = 2570700. Its totient is φ = 811728.

The previous prime is 1668619. The next prime is 1668629. The reversal of 1668626 is 6268661.

It can be written as a sum of positive squares in 2 ways, for example, as 1177225 + 491401 = 1085^2 + 701^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1668629) 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, 11201 + ... + 11348.

2^1668626 is an apocalyptic number.

1668626 is a deficient number, since it is larger than the sum of its proper divisors (902074).

1668626 is a wasteful number, since it uses less digits than its factorization.

1668626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22588.

The product of its digits is 20736, while the sum is 35.

The square root of 1668626 is about 1291.7530723788. The cubic root of 1668626 is about 118.6095528858.

Adding to 1668626 its sum of digits (35), we get a palindrome (1668661).

The spelling of 1668626 in words is "one million, six hundred sixty-eight thousand, six hundred twenty-six".