1340543123 has 2 divisors, whose sum is σ = 1340543124. Its totient is φ = 1340543122.

The previous prime is 1340543117. The next prime is 1340543147. The reversal of 1340543123 is 3213450431.

It is a weak prime.

It is an emirp because it is prime and its reverse (3213450431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1340543123 - 2⁸ = 1340542867 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1340543092 and 1340543101.

It is not a weakly prime, because it can be changed into another prime (1340543023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670271561 + 670271562.

It is an arithmetic number, because the mean of its divisors is an integer number (670271562).

Almost surely, 2^1340543123 is an apocalyptic number.

1340543123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340543123 is an equidigital number, since it uses as much as digits as its factorization.

1340543123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 1340543123 is about 36613.4281787434. The cubic root of 1340543123 is about 1102.6227012961.

Adding to 1340543123 its reverse (3213450431), we get a palindrome (4553993554).

The spelling of 1340543123 in words is "one billion, three hundred forty million, five hundred forty-three thousand, one hundred twenty-three".