1243427 has 2 divisors, whose sum is σ = 1243428. Its totient is φ = 1243426.

The previous prime is 1243421. The next prime is 1243439. The reversal of 1243427 is 7243421.

It is a weak prime.

It is an emirp because it is prime and its reverse (7243421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1243427 - 2¹⁰ = 1242403 is a prime.

It is a super-2 number, since 2×1243427² = 3092221408658, which contains 22 as substring.

It is a Chen prime.

It is a d-powerful number, because it can be written as 1 + 2⁷ + 4⁴ + 3¹¹ + 4¹⁰ + 2⁹ + 7⁵ .

It is not a weakly prime, because it can be changed into another prime (1243421) 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, 621713 + 621714.

It is an arithmetic number, because the mean of its divisors is an integer number (621714).

2^1243427 is an apocalyptic number.

1243427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243427 is an equidigital number, since it uses as much as digits as its factorization.

1243427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 23.

The square root of 1243427 is about 1115.0905792804. The cubic root of 1243427 is about 107.5325879208.

Adding to 1243427 its reverse (7243421), we get a palindrome (8486848).

The spelling of 1243427 in words is "one million, two hundred forty-three thousand, four hundred twenty-seven".