1242105407 has 2 divisors, whose sum is σ = 1242105408. Its totient is φ = 1242105406.

The previous prime is 1242105301. The next prime is 1242105421. The reversal of 1242105407 is 7045012421.

It is a strong prime.

It is an emirp because it is prime and its reverse (7045012421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1242105407 - 2¹⁶ = 1242039871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242105437) 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, 621052703 + 621052704.

It is an arithmetic number, because the mean of its divisors is an integer number (621052704).

Almost surely, 2^1242105407 is an apocalyptic number.

1242105407 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242105407 is an equidigital number, since it uses as much as digits as its factorization.

1242105407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 1242105407 is about 35243.5158149694. The cubic root of 1242105407 is about 1074.9447693276.

Adding to 1242105407 its reverse (7045012421), we get a palindrome (8287117828).

The spelling of 1242105407 in words is "one billion, two hundred forty-two million, one hundred five thousand, four hundred seven".