1242347 has 2 divisors, whose sum is σ = 1242348. Its totient is φ = 1242346.

The previous prime is 1242317. The next prime is 1242359. The reversal of 1242347 is 7432421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1242347 - 2¹⁴ = 1225963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1242317) 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, 621173 + 621174.

It is an arithmetic number, because the mean of its divisors is an integer number (621174).

2^1242347 is an apocalyptic number.

1242347 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242347 is an equidigital number, since it uses as much as digits as its factorization.

1242347 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 1242347 is about 1114.6062084880. The cubic root of 1242347 is about 107.5014458071.

Adding to 1242347 its reverse (7432421), we get a palindrome (8674768).

The spelling of 1242347 in words is "one million, two hundred forty-two thousand, three hundred forty-seven".