1668213 has 12 divisors (see below), whose sum is σ = 2514720. Its totient is φ = 1063656.

The previous prime is 1668211. The next prime is 1668229. The reversal of 1668213 is 3128661.

It is not a de Polignac number, because 1668213 - 2¹ = 1668211 is a prime.

It is a super-2 number, since 2×1668213² = 5565869226738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3823 + ... + 4236.

It is an arithmetic number, because the mean of its divisors is an integer number (209560).

2^1668213 is an apocalyptic number.

It is an amenable number.

1668213 is a deficient number, since it is larger than the sum of its proper divisors (846507).

1668213 is a wasteful number, since it uses less digits than its factorization.

1668213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8088 (or 8085 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 1668213 is about 1291.5932022119. The cubic root of 1668213 is about 118.5997664333.

It can be divided in two parts, 1668 and 213, that added together give a palindrome (1881).

The spelling of 1668213 in words is "one million, six hundred sixty-eight thousand, two hundred thirteen".