2217812 has 6 divisors (see below), whose sum is σ = 3881178. Its totient is φ = 1108904.

The previous prime is 2217799. The next prime is 2217829. The reversal of 2217812 is 2187122.

2217812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1943236 + 274576 = 1394^2 + 524^2 .

It is a congruent number.

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, 277223 + ... + 277230.

It is an arithmetic number, because the mean of its divisors is an integer number (646863).

2^2217812 is an apocalyptic number.

It is an amenable number.

2217812 is a deficient number, since it is larger than the sum of its proper divisors (1663366).

2217812 is a wasteful number, since it uses less digits than its factorization.

2217812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554457 (or 554455 counting only the distinct ones).

The product of its digits is 448, while the sum is 23.

The square root of 2217812 is about 1489.2320168463. The cubic root of 2217812 is about 130.4092036863.

The spelling of 2217812 in words is "two million, two hundred seventeen thousand, eight hundred twelve".