12388079978 has 8 divisors (see below), whose sum is σ = 18610578468. Its totient is φ = 6184553824.

The previous prime is 12388079947. The next prime is 12388079987. The reversal of 12388079978 is 87997088321.

It can be written as a sum of positive squares in 2 ways, for example, as 12299475409 + 88604569 = 110903^2 + 9413^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 12388079978.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4741451 + ... + 4744062.

Almost surely, 2^12388079978 is an apocalyptic number.

12388079978 is a deficient number, since it is larger than the sum of its proper divisors (6222498490).

12388079978 is an equidigital number, since it uses as much as digits as its factorization.

12388079978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9486168.

The product of its (nonzero) digits is 12192768, while the sum is 62.

The spelling of 12388079978 in words is "twelve billion, three hundred eighty-eight million, seventy-nine thousand, nine hundred seventy-eight".