7218838 has 8 divisors (see below), whose sum is σ = 11812680. Its totient is φ = 3281280.

The previous prime is 7218821. The next prime is 7218839. The reversal of 7218838 is 8388127.

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

It is a super-2 number, since 2×7218838² = 104223244140488, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7218797 and 7218806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7218839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164043 + ... + 164086.

It is an arithmetic number, because the mean of its divisors is an integer number (1476585).

Almost surely, 2^7218838 is an apocalyptic number.

7218838 is a deficient number, since it is larger than the sum of its proper divisors (4593842).

7218838 is a wasteful number, since it uses less digits than its factorization.

7218838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328142.

The product of its digits is 21504, while the sum is 37.

The square root of 7218838 is about 2686.7895339978. The cubic root of 7218838 is about 193.2661366419.

It can be divided in two parts, 721 and 8838, that added together give a palindrome (9559).

The spelling of 7218838 in words is "seven million, two hundred eighteen thousand, eight hundred thirty-eight".