1340265761 has 4 divisors (see below), whose sum is σ = 1343173524. Its totient is φ = 1337358000.

The previous prime is 1340265743. The next prime is 1340265779. The reversal of 1340265761 is 1675620431.

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

It is an interprime number because it is at equal distance from previous prime (1340265743) and next prime (1340265779).

It can be written as a sum of positive squares in 2 ways, for example, as 130965136 + 1209300625 = 11444^2 + 34775^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340265761 - 2⁶ = 1340265697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1340265721) 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, 1453190 + ... + 1454111.

It is an arithmetic number, because the mean of its divisors is an integer number (335793381).

Almost surely, 2^1340265761 is an apocalyptic number.

It is an amenable number.

1340265761 is a deficient number, since it is larger than the sum of its proper divisors (2907763).

1340265761 is an equidigital number, since it uses as much as digits as its factorization.

1340265761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2907762.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 1340265761 is about 36609.6402741136. The cubic root of 1340265761 is about 1102.5466508438.

The spelling of 1340265761 in words is "one billion, three hundred forty million, two hundred sixty-five thousand, seven hundred sixty-one".