1340327557 has 4 divisors (see below), whose sum is σ = 1342380780. Its totient is φ = 1338274336.

The previous prime is 1340327543. The next prime is 1340327561. The reversal of 1340327557 is 7557230431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7557230431 = 5081 ⋅1487351.

It can be written as a sum of positive squares in 2 ways, for example, as 671898241 + 668429316 = 25921^2 + 25854^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1340327557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340327537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1025632 + ... + 1026937.

It is an arithmetic number, because the mean of its divisors is an integer number (335595195).

Almost surely, 2^1340327557 is an apocalyptic number.

It is an amenable number.

1340327557 is a deficient number, since it is larger than the sum of its proper divisors (2053223).

1340327557 is an equidigital number, since it uses as much as digits as its factorization.

1340327557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2053222.

The product of its (nonzero) digits is 88200, while the sum is 37.

The square root of 1340327557 is about 36610.4842497337. The cubic root of 1340327557 is about 1102.5635957234.

Adding to 1340327557 its reverse (7557230431), we get a palindrome (8897557988).

The spelling of 1340327557 in words is "one billion, three hundred forty million, three hundred twenty-seven thousand, five hundred fifty-seven".