1340965687 has 2 divisors, whose sum is σ = 1340965688. Its totient is φ = 1340965686.

The previous prime is 1340965673. The next prime is 1340965709. The reversal of 1340965687 is 7865690431.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1340965687 - 2¹¹ = 1340963639 is a prime.

It is a super-2 number, since 2×1340965687² = 3596377947422763938, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1340965687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1340965487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670482843 + 670482844.

It is an arithmetic number, because the mean of its divisors is an integer number (670482844).

Almost surely, 2^1340965687 is an apocalyptic number.

1340965687 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340965687 is an equidigital number, since it uses as much as digits as its factorization.

1340965687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The square root of 1340965687 is about 36619.1983391226. The cubic root of 1340965687 is about 1102.7385448183.

The spelling of 1340965687 in words is "one billion, three hundred forty million, nine hundred sixty-five thousand, six hundred eighty-seven".