1806212 has 6 divisors (see below), whose sum is σ = 3160878. Its totient is φ = 903104.

The previous prime is 1806209. The next prime is 1806221. The reversal of 1806212 is 2126081.

It can be written as a sum of positive squares in only one way, i.e., 1784896 + 21316 = 1336^2 + 146^2 .

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, 225773 + ... + 225780.

It is an arithmetic number, because the mean of its divisors is an integer number (526813).

2^1806212 is an apocalyptic number.

It is an amenable number.

1806212 is a deficient number, since it is larger than the sum of its proper divisors (1354666).

1806212 is a wasteful number, since it uses less digits than its factorization.

1806212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451557 (or 451555 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 1806212 is about 1343.9538682559. The cubic root of 1806212 is about 121.7838149408.

The spelling of 1806212 in words is "one million, eight hundred six thousand, two hundred twelve".