7218398 has 8 divisors (see below), whose sum is σ = 11811960. Its totient is φ = 3281080.

The previous prime is 7218397. The next prime is 7218403. The reversal of 7218398 is 8938127.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7218391) 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, 164033 + ... + 164076.

It is an arithmetic number, because the mean of its divisors is an integer number (1476495).

Almost surely, 2^7218398 is an apocalyptic number.

7218398 is a deficient number, since it is larger than the sum of its proper divisors (4593562).

7218398 is a wasteful number, since it uses less digits than its factorization.

7218398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328122.

The product of its digits is 24192, while the sum is 38.

The square root of 7218398 is about 2686.7076506386. The cubic root of 7218398 is about 193.2622099330.

It can be divided in two parts, 721 and 8398, that added together give a palindrome (9119).

The spelling of 7218398 in words is "seven million, two hundred eighteen thousand, three hundred ninety-eight".