7218279 has 6 divisors (see below), whose sum is σ = 10426416. Its totient is φ = 4812180.

The previous prime is 7218269. The next prime is 7218311. The reversal of 7218279 is 9728127.

It is not a de Polignac number, because 7218279 - 2⁵ = 7218247 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7218209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 401007 + ... + 401024.

It is an arithmetic number, because the mean of its divisors is an integer number (1737736).

Almost surely, 2^7218279 is an apocalyptic number.

7218279 is a deficient number, since it is larger than the sum of its proper divisors (3208137).

7218279 is a wasteful number, since it uses less digits than its factorization.

7218279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802037 (or 802034 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 7218279 is about 2686.6855044832. The cubic root of 7218279 is about 193.2611479092.

The spelling of 7218279 in words is "seven million, two hundred eighteen thousand, two hundred seventy-nine".