1340635139 has 2 divisors, whose sum is σ = 1340635140. Its totient is φ = 1340635138.

The previous prime is 1340635081. The next prime is 1340635141. The reversal of 1340635139 is 9315360431.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1340635139 - 2¹² = 1340631043 is a prime.

Together with 1340635141, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1340635099 and 1340635108.

It is not a weakly prime, because it can be changed into another prime (1340635039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670317569 + 670317570.

It is an arithmetic number, because the mean of its divisors is an integer number (670317570).

Almost surely, 2^1340635139 is an apocalyptic number.

1340635139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340635139 is an equidigital number, since it uses as much as digits as its factorization.

1340635139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 35.

The square root of 1340635139 is about 36614.6847453313. The cubic root of 1340635139 is about 1102.6479290333.

The spelling of 1340635139 in words is "one billion, three hundred forty million, six hundred thirty-five thousand, one hundred thirty-nine".