12993918 has 48 divisors (see below), whose sum is σ = 30520080. Its totient is φ = 3677184.

The previous prime is 12993917. The next prime is 12993931. The reversal of 12993918 is 81939921.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12993918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12993917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56628 + ... + 56856.

It is an arithmetic number, because the mean of its divisors is an integer number (635835).

Almost surely, 2^12993918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12993918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15260040).

12993918 is an abundant number, since it is smaller than the sum of its proper divisors (17526162).

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

12993918 is a wasteful number, since it uses less digits than its factorization.

12993918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441 (or 434 counting only the distinct ones).

The product of its digits is 34992, while the sum is 42.

The square root of 12993918 is about 3604.7077551447. The cubic root of 12993918 is about 235.0967942891.

The spelling of 12993918 in words is "twelve million, nine hundred ninety-three thousand, nine hundred eighteen".