1340240345 has 4 divisors (see below), whose sum is σ = 1608288420. Its totient is φ = 1072192272.

The previous prime is 1340240303. The next prime is 1340240357. The reversal of 1340240345 is 5430420431.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 389628121 + 950612224 = 19739^2 + 30832^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340240345 - 2⁶ = 1340240281 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134024030 + ... + 134024039.

It is an arithmetic number, because the mean of its divisors is an integer number (402072105).

Almost surely, 2^1340240345 is an apocalyptic number.

It is an amenable number.

1340240345 is a deficient number, since it is larger than the sum of its proper divisors (268048075).

1340240345 is an equidigital number, since it uses as much as digits as its factorization.

1340240345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268048074.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 1340240345 is about 36609.2931507834. The cubic root of 1340240345 is about 1102.5396814542.

Adding to 1340240345 its reverse (5430420431), we get a palindrome (6770660776).

The spelling of 1340240345 in words is "one billion, three hundred forty million, two hundred forty thousand, three hundred forty-five".