7218018 has 32 divisors (see below), whose sum is σ = 16128000. Its totient is φ = 2392848.

The previous prime is 7217963. The next prime is 7218019. The reversal of 7218018 is 8108127.

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 = 7217982 and 7218000.

It is not an unprimeable number, because it can be changed into a prime (7218019) 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, 18655 + ... + 19037.

It is an arithmetic number, because the mean of its divisors is an integer number (504000).

Almost surely, 2^7218018 is an apocalyptic number.

7218018 is an abundant number, since it is smaller than the sum of its proper divisors (8909982).

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

7218018 is a wasteful number, since it uses less digits than its factorization.

7218018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743 (or 737 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 7218018 is about 2686.6369311837. The cubic root of 7218018 is about 193.2588185559.

The spelling of 7218018 in words is "seven million, two hundred eighteen thousand, eighteen".