1340405111 has 2 divisors, whose sum is σ = 1340405112. Its totient is φ = 1340405110.

The previous prime is 1340405083. The next prime is 1340405113. The reversal of 1340405111 is 1115040431.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1340405111 - 2⁶ = 1340405047 is a prime.

Together with 1340405113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1340405113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670202555 + 670202556.

It is an arithmetic number, because the mean of its divisors is an integer number (670202556).

Almost surely, 2^1340405111 is an apocalyptic number.

1340405111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340405111 is an equidigital number, since it uses as much as digits as its factorization.

1340405111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1340405111 is about 36611.5434118804. The cubic root of 1340405111 is about 1102.5848608158.

Adding to 1340405111 its reverse (1115040431), we get a palindrome (2455445542).

The spelling of 1340405111 in words is "one billion, three hundred forty million, four hundred five thousand, one hundred eleven".