1340839939 has 2 divisors, whose sum is σ = 1340839940. Its totient is φ = 1340839938.

The previous prime is 1340839919. The next prime is 1340839949. The reversal of 1340839939 is 9399380431.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1340839939 - 2¹¹ = 1340837891 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1340839892 and 1340839901.

It is not a weakly prime, because it can be changed into another prime (1340839919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670419969 + 670419970.

It is an arithmetic number, because the mean of its divisors is an integer number (670419970).

Almost surely, 2^1340839939 is an apocalyptic number.

1340839939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340839939 is an equidigital number, since it uses as much as digits as its factorization.

1340839939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 629856, while the sum is 49.

The square root of 1340839939 is about 36617.4813306432. The cubic root of 1340839939 is about 1102.7040742616.

The spelling of 1340839939 in words is "one billion, three hundred forty million, eight hundred thirty-nine thousand, nine hundred thirty-nine".