7218930 has 16 divisors (see below), whose sum is σ = 17325504. Its totient is φ = 1925040.

The previous prime is 7218929. The next prime is 7218947. The reversal of 7218930 is 398127.

It is a happy number.

It is a super-2 number, since 2×7218930² = 104225900689800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 240631 = 7218930 / (7 + 2 + 1 + 8 + 9 + 3 + 0).

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 120286 + ... + 120345.

It is an arithmetic number, because the mean of its divisors is an integer number (1082844).

Almost surely, 2^7218930 is an apocalyptic number.

7218930 is an abundant number, since it is smaller than the sum of its proper divisors (10106574).

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

7218930 is a wasteful number, since it uses less digits than its factorization.

7218930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240641.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 7218930 is about 2686.8066547483. The cubic root of 7218930 is about 193.2669576609.

The spelling of 7218930 in words is "seven million, two hundred eighteen thousand, nine hundred thirty".