1340040313 has 4 divisors (see below), whose sum is σ = 1340182260. Its totient is φ = 1339898368.

The previous prime is 1340040311. The next prime is 1340040343. The reversal of 1340040313 is 3130400431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3130400431 = 211 ⋅14836021.

It can be written as a sum of positive squares in 2 ways, for example, as 1202494329 + 137545984 = 34677^2 + 11728^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340040313 - 2¹ = 1340040311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1340040311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55720 + ... + 76057.

It is an arithmetic number, because the mean of its divisors is an integer number (335045565).

Almost surely, 2^1340040313 is an apocalyptic number.

It is an amenable number.

1340040313 is a deficient number, since it is larger than the sum of its proper divisors (141947).

1340040313 is a wasteful number, since it uses less digits than its factorization.

1340040313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141946.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1340040313 is about 36606.5610649239. The cubic root of 1340040313 is about 1102.4848270665.

Adding to 1340040313 its reverse (3130400431), we get a palindrome (4470440744).

The spelling of 1340040313 in words is "one billion, three hundred forty million, forty thousand, three hundred thirteen".