1668299 has 2 divisors, whose sum is σ = 1668300. Its totient is φ = 1668298.

The previous prime is 1668253. The next prime is 1668301. The reversal of 1668299 is 9928661.

It is a strong prime.

It is an emirp because it is prime and its reverse (9928661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1668299 is a prime.

Together with 1668301, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1668229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834149 + 834150.

It is an arithmetic number, because the mean of its divisors is an integer number (834150).

2^1668299 is an apocalyptic number.

1668299 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668299 is an equidigital number, since it uses as much as digits as its factorization.

1668299 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 1668299 is about 1291.6264939989. The cubic root of 1668299 is about 118.6018044234.

The spelling of 1668299 in words is "one million, six hundred sixty-eight thousand, two hundred ninety-nine".