7218922 has 8 divisors (see below), whose sum is σ = 11121156. Its totient is φ = 3511872.

The previous prime is 7218919. The next prime is 7218929. The reversal of 7218922 is 2298127.

It can be written as a sum of positive squares in 2 ways, for example, as 7134241 + 84681 = 2671^2 + 291^2 .

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

It is a super-2 number, since 2×7218922² = 104225669684168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7218929) 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 3 ways as a sum of consecutive naturals, for example, 48703 + ... + 48850.

Almost surely, 2^7218922 is an apocalyptic number.

7218922 is a deficient number, since it is larger than the sum of its proper divisors (3902234).

7218922 is a wasteful number, since it uses less digits than its factorization.

7218922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97592.

The product of its digits is 4032, while the sum is 31.

The square root of 7218922 is about 2686.8051659918. The cubic root of 7218922 is about 193.2668862682.

The spelling of 7218922 in words is "seven million, two hundred eighteen thousand, nine hundred twenty-two".