2218726 has 4 divisors (see below), whose sum is σ = 3328092. Its totient is φ = 1109362.

The previous prime is 2218709. The next prime is 2218751. The reversal of 2218726 is 6278122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6278122 = 2 ⋅3139061.

It is a junction number, because it is equal to n+sod(n) for n = 2218694 and 2218703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554680 + ... + 554683.

It is an arithmetic number, because the mean of its divisors is an integer number (832023).

2^2218726 is an apocalyptic number.

2218726 is a deficient number, since it is larger than the sum of its proper divisors (1109366).

2218726 is a wasteful number, since it uses less digits than its factorization.

2218726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109365.

The product of its digits is 2688, while the sum is 28.

The square root of 2218726 is about 1489.5388548138. The cubic root of 2218726 is about 130.4271158811.

The spelling of 2218726 in words is "two million, two hundred eighteen thousand, seven hundred twenty-six".