7216538 has 16 divisors (see below), whose sum is σ = 12408000. Its totient is φ = 3083616.

The previous prime is 7216537. The next prime is 7216543. The reversal of 7216538 is 8356127.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7216537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6470 + ... + 7502.

It is an arithmetic number, because the mean of its divisors is an integer number (775500).

Almost surely, 2^7216538 is an apocalyptic number.

7216538 is a deficient number, since it is larger than the sum of its proper divisors (5191462).

7216538 is a wasteful number, since it uses less digits than its factorization.

7216538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541.

The product of its digits is 10080, while the sum is 32.

The square root of 7216538 is about 2686.3614797715. The cubic root of 7216538 is about 193.2456089000.

The spelling of 7216538 in words is "seven million, two hundred sixteen thousand, five hundred thirty-eight".