1666627 has 2 divisors, whose sum is σ = 1666628. Its totient is φ = 1666626.

The previous prime is 1666619. The next prime is 1666657. The reversal of 1666627 is 7266661.

It is a weak prime.

It is an emirp because it is prime and its reverse (7266661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1666627 - 2³ = 1666619 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1666592 and 1666601.

It is not a weakly prime, because it can be changed into another prime (1666607) 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, 833313 + 833314.

It is an arithmetic number, because the mean of its divisors is an integer number (833314).

2^1666627 is an apocalyptic number.

1666627 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666627 is an equidigital number, since it uses as much as digits as its factorization.

1666627 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 34.

The square root of 1666627 is about 1290.9790858105. The cubic root of 1666627 is about 118.5621695415.

Adding to 1666627 its sum of digits (34), we get a palindrome (1666661).

The spelling of 1666627 in words is "one million, six hundred sixty-six thousand, six hundred twenty-seven".