1664279 has 2 divisors, whose sum is σ = 1664280. Its totient is φ = 1664278.

The previous prime is 1664261. The next prime is 1664287. The reversal of 1664279 is 9724661.

It is a strong prime.

It is an emirp because it is prime and its reverse (9724661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1664279 - 2¹⁶ = 1598743 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666279) 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, 832139 + 832140.

It is an arithmetic number, because the mean of its divisors is an integer number (832140).

2^1664279 is an apocalyptic number.

1664279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664279 is an equidigital number, since it uses as much as digits as its factorization.

1664279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 35.

The square root of 1664279 is about 1290.0693779793. The cubic root of 1664279 is about 118.5064652540.

The spelling of 1664279 in words is "one million, six hundred sixty-four thousand, two hundred seventy-nine".