7218514 has 4 divisors (see below), whose sum is σ = 10827774. Its totient is φ = 3609256.

The previous prime is 7218503. The next prime is 7218529. The reversal of 7218514 is 4158127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4158127 = 107 ⋅38861.

It can be written as a sum of positive squares in only one way, i.e., 7112889 + 105625 = 2667^2 + 325^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1804627 + ... + 1804630.

Almost surely, 2^7218514 is an apocalyptic number.

7218514 is a deficient number, since it is larger than the sum of its proper divisors (3609260).

7218514 is a wasteful number, since it uses less digits than its factorization.

7218514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3609259.

The product of its digits is 2240, while the sum is 28.

The square root of 7218514 is about 2686.7292383119. The cubic root of 7218514 is about 193.2632451717.

The spelling of 7218514 in words is "seven million, two hundred eighteen thousand, five hundred fourteen".