7218879 has 16 divisors (see below), whose sum is σ = 10252800. Its totient is φ = 4504896.

The previous prime is 7218859. The next prime is 7218889. The reversal of 7218879 is 9788127.

It is not a de Polignac number, because 7218879 - 2⁸ = 7218623 is a prime.

It is a super-2 number, since 2×7218879² = 104224428033282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7218879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7218839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4362 + ... + 5784.

It is an arithmetic number, because the mean of its divisors is an integer number (640800).

Almost surely, 2^7218879 is an apocalyptic number.

7218879 is a deficient number, since it is larger than the sum of its proper divisors (3033921).

7218879 is a wasteful number, since it uses less digits than its factorization.

7218879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1534.

The product of its digits is 56448, while the sum is 42.

The square root of 7218879 is about 2686.7971639110. The cubic root of 7218879 is about 193.2665025317.

The spelling of 7218879 in words is "seven million, two hundred eighteen thousand, eight hundred seventy-nine".