1242420079 has 2 divisors, whose sum is σ = 1242420080. Its totient is φ = 1242420078.

The previous prime is 1242420071. The next prime is 1242420103. The reversal of 1242420079 is 9700242421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1242420079 - 2³ = 1242420071 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1242420079.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242420071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621210039 + 621210040.

It is an arithmetic number, because the mean of its divisors is an integer number (621210040).

Almost surely, 2^1242420079 is an apocalyptic number.

1242420079 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242420079 is an equidigital number, since it uses as much as digits as its factorization.

1242420079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 1242420079 is about 35247.9797860814. The cubic root of 1242420079 is about 1075.0355363050.

The spelling of 1242420079 in words is "one billion, two hundred forty-two million, four hundred twenty thousand, seventy-nine".