12722018 has 8 divisors (see below), whose sum is σ = 20205612. Its totient is φ = 5986816.

The previous prime is 12722011. The next prime is 12722041. The reversal of 12722018 is 81022721.

It can be written as a sum of positive squares in 2 ways, for example, as 11336689 + 1385329 = 3367^2 + 1177^2 .

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12721984 and 12722002.

It is not an unprimeable number, because it can be changed into a prime (12722011) 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, 187055 + ... + 187122.

Almost surely, 2^12722018 is an apocalyptic number.

12722018 is a deficient number, since it is larger than the sum of its proper divisors (7483594).

12722018 is a wasteful number, since it uses less digits than its factorization.

12722018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374196.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 12722018 is about 3566.7937983573. The cubic root of 12722018 is about 233.4454078378.

Adding to 12722018 its reverse (81022721), we get a palindrome (93744739).

The spelling of 12722018 in words is "twelve million, seven hundred twenty-two thousand, eighteen".