7225318 has 4 divisors (see below), whose sum is σ = 10837980. Its totient is φ = 3612658.

The previous prime is 7225303. The next prime is 7225327. The reversal of 7225318 is 8135227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8135227 = 37 ⋅219871.

It is a super-2 number, since 2×7225318² = 104410440402248, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1806328 + ... + 1806331.

It is an arithmetic number, because the mean of its divisors is an integer number (2709495).

Almost surely, 2^7225318 is an apocalyptic number.

7225318 is a deficient number, since it is larger than the sum of its proper divisors (3612662).

7225318 is a wasteful number, since it uses less digits than its factorization.

7225318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3612661.

The product of its digits is 3360, while the sum is 28.

The square root of 7225318 is about 2687.9951636861. The cubic root of 7225318 is about 193.3239478863.

Subtracting 7225318 from its reverse (8135227), we obtain a palindrome (909909).

The spelling of 7225318 in words is "seven million, two hundred twenty-five thousand, three hundred eighteen".