12218634 has 32 divisors (see below), whose sum is σ = 28584000. Its totient is φ = 3858192.

The previous prime is 12218629. The next prime is 12218639. The reversal of 12218634 is 43681221.

12218634 is a `hidden beast` number, since 1 + 2 + 21 + 8 + 634 = 666.

It is an interprime number because it is at equal distance from previous prime (12218629) and next prime (12218639).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 12218598 and 12218607.

It is not an unprimeable number, because it can be changed into a prime (12218639) 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 15 ways as a sum of consecutive naturals, for example, 4929 + ... + 6980.

It is an arithmetic number, because the mean of its divisors is an integer number (893250).

Almost surely, 2^12218634 is an apocalyptic number.

12218634 is an abundant number, since it is smaller than the sum of its proper divisors (16365366).

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

12218634 is a wasteful number, since it uses less digits than its factorization.

12218634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11939 (or 11933 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 12218634 is about 3495.5162708819. The cubic root of 12218634 is about 230.3248968539.

Adding to 12218634 its reverse (43681221), we get a palindrome (55899855).

The spelling of 12218634 in words is "twelve million, two hundred eighteen thousand, six hundred thirty-four".