1340740321 has 2 divisors, whose sum is σ = 1340740322. Its totient is φ = 1340740320.

The previous prime is 1340740319. The next prime is 1340740327. The reversal of 1340740321 is 1230470431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1334806225 + 5934096 = 36535^2 + 2436^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340740321 - 2¹ = 1340740319 is a prime.

Together with 1340740319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1340740327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670370160 + 670370161.

It is an arithmetic number, because the mean of its divisors is an integer number (670370161).

Almost surely, 2^1340740321 is an apocalyptic number.

It is an amenable number.

1340740321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340740321 is an equidigital number, since it uses as much as digits as its factorization.

1340740321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 1340740321 is about 36616.1210534377. The cubic root of 1340740321 is about 1102.6767650375.

The spelling of 1340740321 in words is "one billion, three hundred forty million, seven hundred forty thousand, three hundred twenty-one".