1668622 has 4 divisors (see below), whose sum is σ = 2502936. Its totient is φ = 834310.

The previous prime is 1668619. The next prime is 1668629. The reversal of 1668622 is 2268661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2268661 = 557 ⋅4073.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 417154 + ... + 417157.

It is an arithmetic number, because the mean of its divisors is an integer number (625734).

2^1668622 is an apocalyptic number.

1668622 is a deficient number, since it is larger than the sum of its proper divisors (834314).

1668622 is an equidigital number, since it uses as much as digits as its factorization.

1668622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834313.

The product of its digits is 6912, while the sum is 31.

The square root of 1668622 is about 1291.7515240943. The cubic root of 1668622 is about 118.6094581095.

The spelling of 1668622 in words is "one million, six hundred sixty-eight thousand, six hundred twenty-two".