3640866 has 8 divisors (see below), whose sum is σ = 7281744. Its totient is φ = 1213620.

The previous prime is 3640859. The next prime is 3640867. The reversal of 3640866 is 6680463.

3640866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

3640866 is an admirable number.

It is an Ulam number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (3640867) 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 3 ways as a sum of consecutive naturals, for example, 303400 + ... + 303411.

It is an arithmetic number, because the mean of its divisors is an integer number (910218).

Almost surely, 2^3640866 is an apocalyptic number.

3640866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3640866 is a wasteful number, since it uses less digits than its factorization.

3640866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606816.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 3640866 is about 1908.1053430039. The cubic root of 3640866 is about 153.8396317876.

The spelling of 3640866 in words is "three million, six hundred forty thousand, eight hundred sixty-six".