7218469 has 2 divisors, whose sum is σ = 7218470. Its totient is φ = 7218468.

The previous prime is 7218457. The next prime is 7218479. The reversal of 7218469 is 9648127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5230369 + 1988100 = 2287^2 + 1410^2 .

It is an emirp because it is prime and its reverse (9648127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7218469 - 2¹¹ = 7216421 is a prime.

It is a super-2 number, since 2×7218469² = 104212589407922, which contains 22 as substring.

7218469 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7218439) 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 as a sum of consecutive naturals, namely, 3609234 + 3609235.

It is an arithmetic number, because the mean of its divisors is an integer number (3609235).

Almost surely, 2^7218469 is an apocalyptic number.

It is an amenable number.

7218469 is a deficient number, since it is larger than the sum of its proper divisors (1).

7218469 is an equidigital number, since it uses as much as digits as its factorization.

7218469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 37.

The square root of 7218469 is about 2686.7208638041. The cubic root of 7218469 is about 193.2628435718.

The spelling of 7218469 in words is "seven million, two hundred eighteen thousand, four hundred sixty-nine".