7218849 has 16 divisors (see below), whose sum is σ = 10957824. Its totient is φ = 4184400.

The previous prime is 7218839. The next prime is 7218853. The reversal of 7218849 is 9488127.

It is not a de Polignac number, because 7218849 - 2⁵ = 7218817 is a prime.

It is a super-2 number, since 2×7218849² = 104223561769602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7218839) 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, 3997 + ... + 5514.

It is an arithmetic number, because the mean of its divisors is an integer number (684864).

Almost surely, 2^7218849 is an apocalyptic number.

It is an amenable number.

7218849 is a deficient number, since it is larger than the sum of its proper divisors (3738975).

7218849 is a wasteful number, since it uses less digits than its factorization.

7218849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9548.

The product of its digits is 32256, while the sum is 39.

The square root of 7218849 is about 2686.7915810498. The cubic root of 7218849 is about 193.2662348076.

It can be divided in two parts, 72 and 18849, that multiplied together give a triangular number (1357128 = T₁₆₄₇).

The spelling of 7218849 in words is "seven million, two hundred eighteen thousand, eight hundred forty-nine".