1340402143 has 2 divisors, whose sum is σ = 1340402144. Its totient is φ = 1340402142.

The previous prime is 1340402093. The next prime is 1340402153. The reversal of 1340402143 is 3412040431.

It is a strong prime.

It is an emirp because it is prime and its reverse (3412040431) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1340402143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1340402153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670201071 + 670201072.

It is an arithmetic number, because the mean of its divisors is an integer number (670201072).

Almost surely, 2^1340402143 is an apocalyptic number.

1340402143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340402143 is an equidigital number, since it uses as much as digits as its factorization.

1340402143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 1340402143 is about 36611.5028781939. The cubic root of 1340402143 is about 1102.5840470135.

Adding to 1340402143 its reverse (3412040431), we get a palindrome (4752442574).

The spelling of 1340402143 in words is "one billion, three hundred forty million, four hundred two thousand, one hundred forty-three".