1340644573 has 4 divisors (see below), whose sum is σ = 1341116028. Its totient is φ = 1340173120.

The previous prime is 1340644549. The next prime is 1340644577. The reversal of 1340644573 is 3754460431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3754460431 = 811 ⋅4629421.

It can be written as a sum of positive squares in 2 ways, for example, as 707719609 + 632924964 = 26603^2 + 25158^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340644573 - 2²⁹ = 803773661 is a prime.

It is a super-2 number, since 2×1340644573² = 3594655742228704658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340644577) 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 in 3 ways as a sum of consecutive naturals, for example, 231436 + ... + 237157.

It is an arithmetic number, because the mean of its divisors is an integer number (335279007).

Almost surely, 2^1340644573 is an apocalyptic number.

It is an amenable number.

1340644573 is a deficient number, since it is larger than the sum of its proper divisors (471455).

1340644573 is an equidigital number, since it uses as much as digits as its factorization.

1340644573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471454.

The product of its (nonzero) digits is 120960, while the sum is 37.

The square root of 1340644573 is about 36614.8135731974. The cubic root of 1340644573 is about 1102.6505154582.

The spelling of 1340644573 in words is "one billion, three hundred forty million, six hundred forty-four thousand, five hundred seventy-three".