12798138 has 8 divisors (see below), whose sum is σ = 25596288. Its totient is φ = 4266044.

The previous prime is 12798131. The next prime is 12798151. The reversal of 12798138 is 83189721.

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

12798138 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 12798096 and 12798105.

It is not an unprimeable number, because it can be changed into a prime (12798131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1066506 + ... + 1066517.

It is an arithmetic number, because the mean of its divisors is an integer number (3199536).

Almost surely, 2^12798138 is an apocalyptic number.

12798138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12798138 is a wasteful number, since it uses less digits than its factorization.

12798138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2133028.

The product of its digits is 24192, while the sum is 39.

The square root of 12798138 is about 3577.4485321245. The cubic root of 12798138 is about 233.9100757548.

The spelling of 12798138 in words is "twelve million, seven hundred ninety-eight thousand, one hundred thirty-eight".