3643989 has 4 divisors (see below), whose sum is σ = 4858656. Its totient is φ = 2429324.

The previous prime is 3643973. The next prime is 3644021. The reversal of 3643989 is 9893463.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3643989 - 2⁴ = 3643973 is a prime.

It is a D-number.

It is a Curzon number.

3643989 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3643989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3643919) 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 3 ways as a sum of consecutive naturals, for example, 607329 + ... + 607334.

It is an arithmetic number, because the mean of its divisors is an integer number (1214664).

Almost surely, 2^3643989 is an apocalyptic number.

It is an amenable number.

3643989 is a deficient number, since it is larger than the sum of its proper divisors (1214667).

3643989 is a wasteful number, since it uses less digits than its factorization.

3643989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214666.

The product of its digits is 139968, while the sum is 42.

The square root of 3643989 is about 1908.9235186356. The cubic root of 3643989 is about 153.8836051964.

The spelling of 3643989 in words is "three million, six hundred forty-three thousand, nine hundred eighty-nine".