7218487 has 4 divisors (see below), whose sum is σ = 7225096. Its totient is φ = 7211880.

The previous prime is 7218479. The next prime is 7218503. The reversal of 7218487 is 7848127.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 7218487 - 2³ = 7218479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7218457) 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 3 ways as a sum of consecutive naturals, for example, 1233 + ... + 3994.

It is an arithmetic number, because the mean of its divisors is an integer number (1806274).

Almost surely, 2^7218487 is an apocalyptic number.

7218487 is a deficient number, since it is larger than the sum of its proper divisors (6609).

7218487 is a wasteful number, since it uses less digits than its factorization.

7218487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6608.

The product of its digits is 25088, while the sum is 37.

The square root of 7218487 is about 2686.7242136103. The cubic root of 7218487 is about 193.2630042120.

The spelling of 7218487 in words is "seven million, two hundred eighteen thousand, four hundred eighty-seven".