1668479 has 2 divisors, whose sum is σ = 1668480. Its totient is φ = 1668478.

The previous prime is 1668473. The next prime is 1668481. The reversal of 1668479 is 9748661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1668479 - 2¹⁶ = 1602943 is a prime.

Together with 1668481, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1668473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834239 + 834240.

It is an arithmetic number, because the mean of its divisors is an integer number (834240).

2^1668479 is an apocalyptic number.

1668479 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668479 is an equidigital number, since it uses as much as digits as its factorization.

1668479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 41.

The square root of 1668479 is about 1291.6961717060. The cubic root of 1668479 is about 118.6060697573.

The spelling of 1668479 in words is "one million, six hundred sixty-eight thousand, four hundred seventy-nine".