1340420420429 has 2 divisors, whose sum is σ = 1340420420430. Its totient is φ = 1340420420428.

The previous prime is 1340420420413. The next prime is 1340420420441. The reversal of 1340420420429 is 9240240240431.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1264448523529 + 75971896900 = 1124477^2 + 275630^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340420420429 - 2⁴ = 1340420420413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1340420420029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670210210214 + 670210210215.

It is an arithmetic number, because the mean of its divisors is an integer number (670210210215).

Almost surely, 2^{1340420420429} is an apocalyptic number.

It is an amenable number.

1340420420429 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340420420429 is an equidigital number, since it uses as much as digits as its factorization.

1340420420429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 35.

The spelling of 1340420420429 in words is "one trillion, three hundred forty billion, four hundred twenty million, four hundred twenty thousand, four hundred twenty-nine".