7320218 has 4 divisors (see below), whose sum is σ = 10980330. Its totient is φ = 3660108.

The previous prime is 7320211. The next prime is 7320239. The reversal of 7320218 is 8120237.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5031049 + 2289169 = 2243^2 + 1513^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7320193 and 7320202.

It is not an unprimeable number, because it can be changed into a prime (7320211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1830053 + ... + 1830056.

Almost surely, 2^7320218 is an apocalyptic number.

7320218 is a deficient number, since it is larger than the sum of its proper divisors (3660112).

7320218 is a wasteful number, since it uses less digits than its factorization.

7320218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3660111.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 7320218 is about 2705.5901389531. The cubic root of 7320218 is about 194.1666651521.

The spelling of 7320218 in words is "seven million, three hundred twenty thousand, two hundred eighteen".