1340644273 has 4 divisors (see below), whose sum is σ = 1376877940. Its totient is φ = 1304410608.

The previous prime is 1340644243. The next prime is 1340644367. The reversal of 1340644273 is 3724460431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3724460431 = 911 ⋅4088321.

It can be written as a sum of positive squares in 2 ways, for example, as 607967649 + 732676624 = 24657^2 + 27068^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340644273 - 2⁵ = 1340644241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1340644213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18116778 + ... + 18116851.

It is an arithmetic number, because the mean of its divisors is an integer number (344219485).

Almost surely, 2^1340644273 is an apocalyptic number.

It is an amenable number.

1340644273 is a deficient number, since it is larger than the sum of its proper divisors (36233667).

1340644273 is an equidigital number, since it uses as much as digits as its factorization.

1340644273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36233666.

The product of its (nonzero) digits is 48384, while the sum is 34.

The square root of 1340644273 is about 36614.8094764946. The cubic root of 1340644273 is about 1102.6504332104.

The spelling of 1340644273 in words is "one billion, three hundred forty million, six hundred forty-four thousand, two hundred seventy-three".