12381718 has 4 divisors (see below), whose sum is σ = 18572580. Its totient is φ = 6190858.

The previous prime is 12381709. The next prime is 12381731. The reversal of 12381718 is 81718321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81718321 = 251 ⋅325571.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 12381718.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3095428 + ... + 3095431.

It is an arithmetic number, because the mean of its divisors is an integer number (4643145).

Almost surely, 2^12381718 is an apocalyptic number.

12381718 is a deficient number, since it is larger than the sum of its proper divisors (6190862).

12381718 is an equidigital number, since it uses as much as digits as its factorization.

12381718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6190861.

The product of its digits is 2688, while the sum is 31.

The square root of 12381718 is about 3518.7665452542. The cubic root of 12381718 is about 231.3450986513.

The spelling of 12381718 in words is "twelve million, three hundred eighty-one thousand, seven hundred eighteen".