1243420067 has 2 divisors, whose sum is σ = 1243420068. Its totient is φ = 1243420066.

The previous prime is 1243420033. The next prime is 1243420081. The reversal of 1243420067 is 7600243421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1243420067 - 2²⁰ = 1242371491 is a prime.

It is not a weakly prime, because it can be changed into another prime (1243420267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621710033 + 621710034.

It is an arithmetic number, because the mean of its divisors is an integer number (621710034).

Almost surely, 2^1243420067 is an apocalyptic number.

1243420067 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243420067 is an equidigital number, since it uses as much as digits as its factorization.

1243420067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 1243420067 is about 35262.1619728570. The cubic root of 1243420067 is about 1075.3238806325.

Adding to 1243420067 its reverse (7600243421), we get a palindrome (8843663488).

The spelling of 1243420067 in words is "one billion, two hundred forty-three million, four hundred twenty thousand, sixty-seven".