2729218 has 4 divisors (see below), whose sum is σ = 4093830. Its totient is φ = 1364608.

The previous prime is 2729189. The next prime is 2729227. The reversal of 2729218 is 8129272.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2601769 + 127449 = 1613^2 + 357^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 2729218.

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, 682303 + ... + 682306.

2^2729218 is an apocalyptic number.

2729218 is a deficient number, since it is larger than the sum of its proper divisors (1364612).

2729218 is a wasteful number, since it uses less digits than its factorization.

2729218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364611.

The product of its digits is 4032, while the sum is 31.

The square root of 2729218 is about 1652.0345032716. The cubic root of 2729218 is about 139.7481526633.

The spelling of 2729218 in words is "two million, seven hundred twenty-nine thousand, two hundred eighteen".