12261018 has 32 divisors (see below), whose sum is σ = 30574080. Its totient is φ = 3184560.

The previous prime is 12261013. The next prime is 12261043. The reversal of 12261018 is 81016221.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12260985 and 12261003.

It is not an unprimeable number, because it can be changed into a prime (12261013) 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 15 ways as a sum of consecutive naturals, for example, 12808 + ... + 13731.

It is an arithmetic number, because the mean of its divisors is an integer number (955440).

Almost surely, 2^12261018 is an apocalyptic number.

12261018 is an abundant number, since it is smaller than the sum of its proper divisors (18313062).

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

12261018 is a wasteful number, since it uses less digits than its factorization.

12261018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26562.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 12261018 is about 3501.5736462339. The cubic root of 12261018 is about 230.5909065281.

Adding to 12261018 its reverse (81016221), we get a palindrome (93277239).

The spelling of 12261018 in words is "twelve million, two hundred sixty-one thousand, eighteen".