3640489 has 4 divisors (see below), whose sum is σ = 3651156. Its totient is φ = 3629824.

The previous prime is 3640487. The next prime is 3640493. The reversal of 3640489 is 9840463.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9840463 = 89 ⋅110567.

It can be written as a sum of positive squares in 2 ways, for example, as 1488400 + 2152089 = 1220^2 + 1467^2 .

It is a cyclic number.

It is not a de Polignac number, because 3640489 - 2¹ = 3640487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4804 + ... + 5509.

It is an arithmetic number, because the mean of its divisors is an integer number (912789).

Almost surely, 2^3640489 is an apocalyptic number.

It is an amenable number.

3640489 is a deficient number, since it is larger than the sum of its proper divisors (10667).

3640489 is a wasteful number, since it uses less digits than its factorization.

3640489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10666.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 3640489 is about 1908.0065513514. The cubic root of 3640489 is about 153.8343217375.

The spelling of 3640489 in words is "three million, six hundred forty thousand, four hundred eighty-nine".