1240122643 has 2 divisors, whose sum is σ = 1240122644. Its totient is φ = 1240122642.

The previous prime is 1240122641. The next prime is 1240122649. The reversal of 1240122643 is 3462210421.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1240122643 - 2¹ = 1240122641 is a prime.

Together with 1240122641, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1240122641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620061321 + 620061322.

It is an arithmetic number, because the mean of its divisors is an integer number (620061322).

Almost surely, 2^1240122643 is an apocalyptic number.

1240122643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240122643 is an equidigital number, since it uses as much as digits as its factorization.

1240122643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 1240122643 is about 35215.3750938422. The cubic root of 1240122643 is about 1074.3724891550.

The spelling of 1240122643 in words is "one billion, two hundred forty million, one hundred twenty-two thousand, six hundred forty-three".