1664227 has 2 divisors, whose sum is σ = 1664228. Its totient is φ = 1664226.

The previous prime is 1664123. The next prime is 1664251. The reversal of 1664227 is 7224661.

It is a strong prime.

It is an emirp because it is prime and its reverse (7224661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1664227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1664195 and 1664204.

It is not a weakly prime, because it can be changed into another prime (1664287) 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, 832113 + 832114.

It is an arithmetic number, because the mean of its divisors is an integer number (832114).

2^1664227 is an apocalyptic number.

1664227 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664227 is an equidigital number, since it uses as much as digits as its factorization.

1664227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 28.

The square root of 1664227 is about 1290.0492238671. The cubic root of 1664227 is about 118.5052310058.

Adding to 1664227 its reverse (7224661), we get a palindrome (8888888).

It can be divided in two parts, 1664 and 227, that added together give a triangular number (1891 = T₆₁).

The spelling of 1664227 in words is "one million, six hundred sixty-four thousand, two hundred twenty-seven".