1340140243 has 32 divisors (see below), whose sum is σ = 1618444800. Its totient is φ = 1096229376.

The previous prime is 1340140237. The next prime is 1340140271. The reversal of 1340140243 is 3420410431.

It is a cyclic number.

It is not a de Polignac number, because 1340140243 - 2⁵ = 1340140211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1340140213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 750730 + ... + 752512.

It is an arithmetic number, because the mean of its divisors is an integer number (50576400).

Almost surely, 2^1340140243 is an apocalyptic number.

1340140243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1340140243 is a deficient number, since it is larger than the sum of its proper divisors (278304557).

1340140243 is a wasteful number, since it uses less digits than its factorization.

1340140243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011.

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

The square root of 1340140243 is about 36607.9259587319. The cubic root of 1340140243 is about 1102.5122313591.

Adding to 1340140243 its reverse (3420410431), we get a palindrome (4760550674).

The spelling of 1340140243 in words is "one billion, three hundred forty million, one hundred forty thousand, two hundred forty-three".