3909661 has 12 divisors (see below), whose sum is σ = 4614492. Its totient is φ = 3302208.

The previous prime is 3909641. The next prime is 3909667. The reversal of 3909661 is 1669093.

3909661 is digitally balanced in base 8, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 3261636 + 648025 = 1806^2 + 805^2 .

It is not a de Polignac number, because 3909661 - 2⁷ = 3909533 is a prime.

It is a Duffinian number.

3909661 is strictly pandigital in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3909667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3031 + ... + 4123.

It is an arithmetic number, because the mean of its divisors is an integer number (384541).

Almost surely, 2^3909661 is an apocalyptic number.

It is an amenable number.

3909661 is a deficient number, since it is larger than the sum of its proper divisors (704831).

3909661 is a wasteful number, since it uses less digits than its factorization.

3909661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180 (or 1173 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 3909661 is about 1977.2862716360. The cubic root of 3909661 is about 157.5359588678.

The spelling of 3909661 in words is "three million, nine hundred nine thousand, six hundred sixty-one".