3661409 has 8 divisors (see below), whose sum is σ = 3982248. Its totient is φ = 3352320.

The previous prime is 3661391. The next prime is 3661417. The reversal of 3661409 is 9041663.

It can be written as a sum of positive squares in 4 ways, for example, as 2512225 + 1149184 = 1585^2 + 1072^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3661409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3661429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2282 + ... + 3539.

It is an arithmetic number, because the mean of its divisors is an integer number (497781).

Almost surely, 2^3661409 is an apocalyptic number.

It is an amenable number.

3661409 is a deficient number, since it is larger than the sum of its proper divisors (320839).

3661409 is a wasteful number, since it uses less digits than its factorization.

3661409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5875.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 3661409 is about 1913.4808595855. The cubic root of 3661409 is about 154.1284277534.

The spelling of 3661409 in words is "three million, six hundred sixty-one thousand, four hundred nine".