1340607731 has 2 divisors, whose sum is σ = 1340607732. Its totient is φ = 1340607730.

The previous prime is 1340607721. The next prime is 1340607761. The reversal of 1340607731 is 1377060431.

It is a weak prime.

It is an emirp because it is prime and its reverse (1377060431) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1340607731 is a prime.

It is a super-2 number, since 2×1340607731² = 3594458176833936722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1340607721) 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 as a sum of consecutive naturals, namely, 670303865 + 670303866.

It is an arithmetic number, because the mean of its divisors is an integer number (670303866).

Almost surely, 2^1340607731 is an apocalyptic number.

1340607731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340607731 is an equidigital number, since it uses as much as digits as its factorization.

1340607731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 1340607731 is about 36614.3104673569. The cubic root of 1340607731 is about 1102.6404147889.

The spelling of 1340607731 in words is "one billion, three hundred forty million, six hundred seven thousand, seven hundred thirty-one".