1820212 has 6 divisors (see below), whose sum is σ = 3185378. Its totient is φ = 910104.

The previous prime is 1820201. The next prime is 1820213. The reversal of 1820212 is 2120281.

It can be written as a sum of positive squares in only one way, i.e., 1623076 + 197136 = 1274^2 + 444^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820213) by changing a digit.

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, 227523 + ... + 227530.

2^1820212 is an apocalyptic number.

It is an amenable number.

1820212 is a deficient number, since it is larger than the sum of its proper divisors (1365166).

1820212 is a wasteful number, since it uses less digits than its factorization.

1820212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455057 (or 455055 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1820212 is about 1349.1523264628. The cubic root of 1820212 is about 122.0976553946.

Adding to 1820212 its reverse (2120281), we get a palindrome (3940493).

The spelling of 1820212 in words is "one million, eight hundred twenty thousand, two hundred twelve".