1242140947 has 2 divisors, whose sum is σ = 1242140948. Its totient is φ = 1242140946.

The previous prime is 1242140929. The next prime is 1242140959. The reversal of 1242140947 is 7490412421.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (7490412421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242140947 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242120947) 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, 621070473 + 621070474.

It is an arithmetic number, because the mean of its divisors is an integer number (621070474).

Almost surely, 2^1242140947 is an apocalyptic number.

1242140947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242140947 is an equidigital number, since it uses as much as digits as its factorization.

1242140947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 1242140947 is about 35244.0200175860. The cubic root of 1242140947 is about 1074.9550215903.

The spelling of 1242140947 in words is "one billion, two hundred forty-two million, one hundred forty thousand, nine hundred forty-seven".