3640985 has 8 divisors (see below), whose sum is σ = 4487496. Its totient is φ = 2833920.

The previous prime is 3640937. The next prime is 3640991. The reversal of 3640985 is 5890463.

It can be written as a sum of positive squares in 4 ways, for example, as 2155024 + 1485961 = 1468^2 + 1219^2 .

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

It is not a de Polignac number, because 3640985 - 2¹⁴ = 3624601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 9656 + ... + 10025.

It is an arithmetic number, because the mean of its divisors is an integer number (560937).

Almost surely, 2^3640985 is an apocalyptic number.

It is an amenable number.

3640985 is a deficient number, since it is larger than the sum of its proper divisors (846511).

3640985 is a wasteful number, since it uses less digits than its factorization.

3640985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19723.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 3640985 is about 1908.1365255138. The cubic root of 3640985 is about 153.8413078281.

The spelling of 3640985 in words is "three million, six hundred forty thousand, nine hundred eighty-five".