12397828549 has 4 divisors (see below), whose sum is σ = 12398057920. Its totient is φ = 12397599180.

The previous prime is 12397828517. The next prime is 12397828559. The reversal of 12397828549 is 94582879321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94582879321 = 7 ⋅13511839903.

It is a cyclic number.

It is not a de Polignac number, because 12397828549 - 2⁵ = 12397828517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12397828493 and 12397828502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12397828559) 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, 16132 + ... + 158290.

It is an arithmetic number, because the mean of its divisors is an integer number (3099514480).

Almost surely, 2^12397828549 is an apocalyptic number.

It is an amenable number.

12397828549 is a deficient number, since it is larger than the sum of its proper divisors (229371).

12397828549 is an equidigital number, since it uses as much as digits as its factorization.

12397828549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229370.

The product of its digits is 8709120, while the sum is 58.

The spelling of 12397828549 in words is "twelve billion, three hundred ninety-seven million, eight hundred twenty-eight thousand, five hundred forty-nine".