2208681 has 16 divisors (see below), whose sum is σ = 3297600. Its totient is φ = 1461024.

The previous prime is 2208659. The next prime is 2208683. The reversal of 2208681 is 1868022.

2208681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2208681 - 2¹³ = 2200489 is a prime.

It is a super-2 number, since 2×2208681² = 9756543519522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2208683) 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 in 15 ways as a sum of consecutive naturals, for example, 4605 + ... + 5061.

It is an arithmetic number, because the mean of its divisors is an integer number (206100).

2^2208681 is an apocalyptic number.

It is an amenable number.

2208681 is a deficient number, since it is larger than the sum of its proper divisors (1088919).

2208681 is a wasteful number, since it uses less digits than its factorization.

2208681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645 (or 639 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 2208681 is about 1486.1631808116. The cubic root of 2208681 is about 130.2299873590.

The spelling of 2208681 in words is "two million, two hundred eight thousand, six hundred eighty-one".