4089661 has 4 divisors (see below), whose sum is σ = 4105024. Its totient is φ = 4074300.

The previous prime is 4089643. The next prime is 4089677. The reversal of 4089661 is 1669804.

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 4089661 - 2⁹ = 4089149 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 (4081661) 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, 7275 + ... + 7816.

It is an arithmetic number, because the mean of its divisors is an integer number (1026256).

Almost surely, 2^4089661 is an apocalyptic number.

It is an amenable number.

4089661 is a deficient number, since it is larger than the sum of its proper divisors (15363).

4089661 is a wasteful number, since it uses less digits than its factorization.

4089661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15362.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 4089661 is about 2022.2910275230. The cubic root of 4089661 is about 159.9174183215.

The spelling of 4089661 in words is "four million, eighty-nine thousand, six hundred sixty-one".