3640889 has 8 divisors (see below), whose sum is σ = 4200768. Its totient is φ = 3090960.

The previous prime is 3640867. The next prime is 3640891. The reversal of 3640889 is 9880463.

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

It is a cyclic number.

It is not a de Polignac number, because 3640889 - 2⁸ = 3640633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3640829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1682 + ... + 3179.

It is an arithmetic number, because the mean of its divisors is an integer number (525096).

Almost surely, 2^3640889 is an apocalyptic number.

It is an amenable number.

3640889 is a deficient number, since it is larger than the sum of its proper divisors (559879).

3640889 is a wasteful number, since it uses less digits than its factorization.

3640889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4975.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 3640889 is about 1908.1113699153. Note that the first 3 decimals coincide. The cubic root of 3640889 is about 153.8399557311.

The spelling of 3640889 in words is "three million, six hundred forty thousand, eight hundred eighty-nine".