7218724 has 12 divisors (see below), whose sum is σ = 12674844. Its totient is φ = 3597344.

The previous prime is 7218721. The next prime is 7218749. The reversal of 7218724 is 4278127.

It can be written as a sum of positive squares in 2 ways, for example, as 624100 + 6594624 = 790^2 + 2568^2 .

It is not an unprimeable number, because it can be changed into a prime (7218721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1579 + ... + 4114.

It is an arithmetic number, because the mean of its divisors is an integer number (1056237).

Almost surely, 2^7218724 is an apocalyptic number.

It is an amenable number.

7218724 is a deficient number, since it is larger than the sum of its proper divisors (5456120).

7218724 is a wasteful number, since it uses less digits than its factorization.

7218724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6014 (or 6012 counting only the distinct ones).

The product of its digits is 6272, while the sum is 31.

The square root of 7218724 is about 2686.7683190033. The cubic root of 7218724 is about 193.2651192826.

The spelling of 7218724 in words is "seven million, two hundred eighteen thousand, seven hundred twenty-four".