12723795409 has 4 divisors (see below), whose sum is σ = 13702548916. Its totient is φ = 11745041904.

The previous prime is 12723795389. The next prime is 12723795421. The reversal of 12723795409 is 90459732721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90459732721 = 131591 ⋅687431.

It can be written as a sum of positive squares in 2 ways, for example, as 7827294784 + 4896500625 = 88472^2 + 69975^2 .

It is a cyclic number.

It is not a de Polignac number, because 12723795409 - 2⁷ = 12723795281 is a prime.

It is a super-3 number, since 3×12723795409³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12729795409) 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, 489376734 + ... + 489376759.

It is an arithmetic number, because the mean of its divisors is an integer number (3425637229).

Almost surely, 2^12723795409 is an apocalyptic number.

It is an amenable number.

12723795409 is a deficient number, since it is larger than the sum of its proper divisors (978753507).

12723795409 is an equidigital number, since it uses as much as digits as its factorization.

12723795409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978753506.

The product of its (nonzero) digits is 952560, while the sum is 49.

The spelling of 12723795409 in words is "twelve billion, seven hundred twenty-three million, seven hundred ninety-five thousand, four hundred nine".