7218099 has 32 divisors (see below), whose sum is σ = 12346880. Its totient is φ = 4082400.

The previous prime is 7218083. The next prime is 7218121. The reversal of 7218099 is 9908127.

It is a happy number.

It is not a de Polignac number, because 7218099 - 2⁴ = 7218083 is a prime.

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 (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34104 + ... + 34314.

It is an arithmetic number, because the mean of its divisors is an integer number (385840).

Almost surely, 2^7218099 is an apocalyptic number.

7218099 is a deficient number, since it is larger than the sum of its proper divisors (5128781).

7218099 is a wasteful number, since it uses less digits than its factorization.

7218099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408 (or 402 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 7218099 is about 2686.6520057499. The cubic root of 7218099 is about 193.2595414647.

Subtracting from 7218099 its product of nonzero digits (9072), we obtain a palindrome (7209027).

The spelling of 7218099 in words is "seven million, two hundred eighteen thousand, ninety-nine".