1666727 has 2 divisors, whose sum is σ = 1666728. Its totient is φ = 1666726.

The previous prime is 1666711. The next prime is 1666729. The reversal of 1666727 is 7276661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1666727 - 2⁴ = 1666711 is a prime.

Together with 1666729, 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 (1666729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833363 + 833364.

It is an arithmetic number, because the mean of its divisors is an integer number (833364).

2^1666727 is an apocalyptic number.

1666727 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666727 is an equidigital number, since it uses as much as digits as its factorization.

1666727 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 35.

The square root of 1666727 is about 1291.0178155239. The cubic root of 1666727 is about 118.5645407939.

The spelling of 1666727 in words is "one million, six hundred sixty-six thousand, seven hundred twenty-seven".