1340042423 has 2 divisors, whose sum is σ = 1340042424. Its totient is φ = 1340042422.

The previous prime is 1340042383. The next prime is 1340042441. The reversal of 1340042423 is 3242400431.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1340042423 - 2⁶ = 1340042359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1340042923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670021211 + 670021212.

It is an arithmetic number, because the mean of its divisors is an integer number (670021212).

Almost surely, 2^1340042423 is an apocalyptic number.

1340042423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340042423 is an equidigital number, since it uses as much as digits as its factorization.

1340042423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 1340042423 is about 36606.5898848827. The cubic root of 1340042423 is about 1102.4854057162.

Adding to 1340042423 its reverse (3242400431), we get a palindrome (4582442854).

The spelling of 1340042423 in words is "one billion, three hundred forty million, forty-two thousand, four hundred twenty-three".