12138774015 has 8 divisors (see below), whose sum is σ = 19422038448. Its totient is φ = 6474012800.

The previous prime is 12138774013. The next prime is 12138774071. The reversal of 12138774015 is 51047783121.

It is a happy number.

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

It is not a de Polignac number, because 12138774015 - 2¹ = 12138774013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12138774013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 404625786 + ... + 404625815.

It is an arithmetic number, because the mean of its divisors is an integer number (2427754806).

Almost surely, 2^12138774015 is an apocalyptic number.

12138774015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12138774015 is a deficient number, since it is larger than the sum of its proper divisors (7283264433).

12138774015 is an equidigital number, since it uses as much as digits as its factorization.

12138774015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809251609.

The product of its (nonzero) digits is 47040, while the sum is 39.

The spelling of 12138774015 in words is "twelve billion, one hundred thirty-eight million, seven hundred seventy-four thousand, fifteen".