12115998 has 12 divisors (see below), whose sum is σ = 26251368. Its totient is φ = 4038660.

The previous prime is 12115969. The next prime is 12116011. The reversal of 12115998 is 89951121.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 336538 + ... + 336573.

It is an arithmetic number, because the mean of its divisors is an integer number (2187614).

Almost surely, 2^12115998 is an apocalyptic number.

12115998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12115998 is an abundant number, since it is smaller than the sum of its proper divisors (14135370).

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

12115998 is a wasteful number, since it uses less digits than its factorization.

12115998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673119 (or 673116 counting only the distinct ones).

The product of its digits is 6480, while the sum is 36.

The square root of 12115998 is about 3480.8042174187. The cubic root of 12115998 is about 229.6781762424.

The spelling of 12115998 in words is "twelve million, one hundred fifteen thousand, nine hundred ninety-eight".