1340360639 has 4 divisors (see below), whose sum is σ = 1344589224. Its totient is φ = 1336132056.

The previous prime is 1340360633. The next prime is 1340360669. The reversal of 1340360639 is 9360630431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9360630431 = 51511 ⋅181721.

It is a cyclic number.

It is not a de Polignac number, because 1340360639 - 2⁸ = 1340360383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1340360599 and 1340360608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340360633) 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, 2113817 + ... + 2114450.

It is an arithmetic number, because the mean of its divisors is an integer number (336147306).

Almost surely, 2^1340360639 is an apocalyptic number.

1340360639 is a deficient number, since it is larger than the sum of its proper divisors (4228585).

1340360639 is an equidigital number, since it uses as much as digits as its factorization.

1340360639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4228584.

The product of its (nonzero) digits is 34992, while the sum is 35.

The square root of 1340360639 is about 36610.9360574132. The cubic root of 1340360639 is about 1102.5726668167.

The spelling of 1340360639 in words is "one billion, three hundred forty million, three hundred sixty thousand, six hundred thirty-nine".