2721812 has 6 divisors (see below), whose sum is σ = 4763178. Its totient is φ = 1360904.

The previous prime is 2721811. The next prime is 2721821. The reversal of 2721812 is 2181272.

It can be written as a sum of positive squares in only one way, i.e., 2572816 + 148996 = 1604^2 + 386^2 .

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2721811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340223 + ... + 340230.

It is an arithmetic number, because the mean of its divisors is an integer number (793863).

2^2721812 is an apocalyptic number.

It is an amenable number.

2721812 is a deficient number, since it is larger than the sum of its proper divisors (2041366).

2721812 is a wasteful number, since it uses less digits than its factorization.

2721812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680457 (or 680455 counting only the distinct ones).

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

The square root of 2721812 is about 1649.7915019784. The cubic root of 2721812 is about 139.6216313910.

The spelling of 2721812 in words is "two million, seven hundred twenty-one thousand, eight hundred twelve".