12078669409 has 3 divisors (see below), whose sum is σ = 12078779313. Its totient is φ = 12078559506.

The previous prime is 12078669377. The next prime is 12078669431. The reversal of 12078669409 is 90496687021.

It is a happy number.

The square root of 12078669409 is 109903.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 12078669409 - 2⁵ = 12078669377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12078669209) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 54952 + ... + 164854.

It is an arithmetic number, because the mean of its divisors is an integer number (4026259771).

Almost surely, 2^12078669409 is an apocalyptic number.

12078669409 is the 109903-rd square number.

12078669409 is the 54952-nd centered octagonal number.

It is an amenable number.

12078669409 is a deficient number, since it is larger than the sum of its proper divisors (109904).

12078669409 is an frugal number, since it uses more digits than its factorization.

12078669409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219806 (or 109903 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 12078669409 in words is "twelve billion, seventy-eight million, six hundred sixty-nine thousand, four hundred nine".