2156218 has 4 divisors (see below), whose sum is σ = 3234330. Its totient is φ = 1078108.

The previous prime is 2156207. The next prime is 2156221. The reversal of 2156218 is 8126512.

2156218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 1656369 + 499849 = 1287^2 + 707^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2156192 and 2156201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 539053 + ... + 539056.

2^2156218 is an apocalyptic number.

2156218 is a deficient number, since it is larger than the sum of its proper divisors (1078112).

2156218 is a wasteful number, since it uses less digits than its factorization.

2156218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078111.

The product of its digits is 960, while the sum is 25.

The square root of 2156218 is about 1468.4066194348. The cubic root of 2156218 is about 129.1905922150.

The spelling of 2156218 in words is "two million, one hundred fifty-six thousand, two hundred eighteen".