7218236 has 6 divisors (see below), whose sum is σ = 12631920. Its totient is φ = 3609116.

The previous prime is 7218227. The next prime is 7218247. The reversal of 7218236 is 6328127.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 7218199 and 7218208.

It is a congruent number.

It is an unprimeable number.

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, 902276 + ... + 902283.

It is an arithmetic number, because the mean of its divisors is an integer number (2105320).

Almost surely, 2^7218236 is an apocalyptic number.

It is an amenable number.

7218236 is a deficient number, since it is larger than the sum of its proper divisors (5413684).

7218236 is a wasteful number, since it uses less digits than its factorization.

7218236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1804563 (or 1804561 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 7218236 is about 2686.6775020460. The cubic root of 7218236 is about 193.2607641499.

The spelling of 7218236 in words is "seven million, two hundred eighteen thousand, two hundred thirty-six".