2820218 has 4 divisors (see below), whose sum is σ = 4230330. Its totient is φ = 1410108.

The previous prime is 2820211. The next prime is 2820229. The reversal of 2820218 is 8120282.

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., 1885129 + 935089 = 1373^2 + 967^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2820193 and 2820202.

It is not an unprimeable number, because it can be changed into a prime (2820211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 705053 + ... + 705056.

2^2820218 is an apocalyptic number.

2820218 is a deficient number, since it is larger than the sum of its proper divisors (1410112).

2820218 is a wasteful number, since it uses less digits than its factorization.

2820218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410111.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 2820218 is about 1679.3504696757. The cubic root of 2820218 is about 141.2844049118.

The spelling of 2820218 in words is "two million, eight hundred twenty thousand, two hundred eighteen".