1669243 has 2 divisors, whose sum is σ = 1669244. Its totient is φ = 1669242.

The previous prime is 1669237. The next prime is 1669249. The reversal of 1669243 is 3429661.

It is a balanced prime because it is at equal distance from previous prime (1669237) and next prime (1669249).

It is an emirp because it is prime and its reverse (3429661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1669243 is a prime.

It is not a weakly prime, because it can be changed into another prime (1669249) 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, 834621 + 834622.

It is an arithmetic number, because the mean of its divisors is an integer number (834622).

2^1669243 is an apocalyptic number.

1669243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669243 is an equidigital number, since it uses as much as digits as its factorization.

1669243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 31.

The square root of 1669243 is about 1291.9918730395. The cubic root of 1669243 is about 118.6241703168.

It can be divided in two parts, 166 and 9243, that added together give a square (9409 = 97²).

The spelling of 1669243 in words is "one million, six hundred sixty-nine thousand, two hundred forty-three".