7218542 has 16 divisors (see below), whose sum is σ = 11333952. Its totient is φ = 3444480.

The previous prime is 7218529. The next prime is 7218551. The reversal of 7218542 is 2458127.

It is a congruent number.

It is an unprimeable number.

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, 2918 + ... + 4790.

It is an arithmetic number, because the mean of its divisors is an integer number (708372).

Almost surely, 2^7218542 is an apocalyptic number.

7218542 is a deficient number, since it is larger than the sum of its proper divisors (4115410).

7218542 is a wasteful number, since it uses less digits than its factorization.

7218542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1963.

The product of its digits is 4480, while the sum is 29.

The square root of 7218542 is about 2686.7344491036. The cubic root of 7218542 is about 193.2634950553.

It can be divided in two parts, 72185 and 42, that added together give a palindrome (72227).

The spelling of 7218542 in words is "seven million, two hundred eighteen thousand, five hundred forty-two".