1340681465 has 4 divisors (see below), whose sum is σ = 1608817764. Its totient is φ = 1072545168.

The previous prime is 1340681453. The next prime is 1340681479. The reversal of 1340681465 is 5641860431.

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

It can be written as a sum of positive squares in 2 ways, for example, as 434430649 + 906250816 = 20843^2 + 30104^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340681465 - 2⁴ = 1340681449 is a prime.

It is a super-3 number, since 3×1340681465³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 134068142 + ... + 134068151.

It is an arithmetic number, because the mean of its divisors is an integer number (402204441).

Almost surely, 2^1340681465 is an apocalyptic number.

It is an amenable number.

1340681465 is a deficient number, since it is larger than the sum of its proper divisors (268136299).

1340681465 is an equidigital number, since it uses as much as digits as its factorization.

1340681465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268136298.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 1340681465 is about 36615.3173548994. The cubic root of 1340681465 is about 1102.6606296502.

The spelling of 1340681465 in words is "one billion, three hundred forty million, six hundred eighty-one thousand, four hundred sixty-five".