2721866 has 32 divisors (see below), whose sum is σ = 4976640. Its totient is φ = 1091376.

The previous prime is 2721863. The next prime is 2721869. The reversal of 2721866 is 6681272.

It is an interprime number because it is at equal distance from previous prime (2721863) and next prime (2721869).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2721863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25385 + ... + 25491.

It is an arithmetic number, because the mean of its divisors is an integer number (155520).

2^2721866 is an apocalyptic number.

2721866 is a deficient number, since it is larger than the sum of its proper divisors (2254774).

2721866 is a wasteful number, since it uses less digits than its factorization.

2721866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218.

The product of its digits is 8064, while the sum is 32.

The square root of 2721866 is about 1649.8078676016. The cubic root of 2721866 is about 139.6225547365.

The spelling of 2721866 in words is "two million, seven hundred twenty-one thousand, eight hundred sixty-six".