1340564065 has 4 divisors (see below), whose sum is σ = 1608676884. Its totient is φ = 1072451248.

The previous prime is 1340564047. The next prime is 1340564081. The reversal of 1340564065 is 5604650431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5604650431 = 41 ⋅136698791.

It can be written as a sum of positive squares in 2 ways, for example, as 913067089 + 427496976 = 30217^2 + 20676^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1340564065 is a prime.

It is a super-2 number, since 2×1340564065² = 3594224024738648450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1340564065.

It is an unprimeable number.

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, 134056402 + ... + 134056411.

It is an arithmetic number, because the mean of its divisors is an integer number (402169221).

Almost surely, 2^1340564065 is an apocalyptic number.

It is an amenable number.

1340564065 is a deficient number, since it is larger than the sum of its proper divisors (268112819).

1340564065 is an equidigital number, since it uses as much as digits as its factorization.

1340564065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268112818.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 1340564065 is about 36613.7141655965. The cubic root of 1340564065 is about 1102.6284429998.

The spelling of 1340564065 in words is "one billion, three hundred forty million, five hundred sixty-four thousand, sixty-five".