3661005 has 16 divisors (see below), whose sum is σ = 5914944. Its totient is φ = 1933440.

The previous prime is 3660961. The next prime is 3661019. The reversal of 3661005 is 5001663.

It is not a de Polignac number, because 3661005 - 2⁹ = 3660493 is a prime.

It is a super-2 number, since 2×3661005² = 26805915220050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 465 + ... + 2745.

It is an arithmetic number, because the mean of its divisors is an integer number (369684).

Almost surely, 2^3661005 is an apocalyptic number.

It is an amenable number.

3661005 is a deficient number, since it is larger than the sum of its proper divisors (2253939).

3661005 is a wasteful number, since it uses less digits than its factorization.

3661005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2396.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 3661005 is about 1913.3752899000. The cubic root of 3661005 is about 154.1227586995.

Adding to 3661005 its reverse (5001663), we get a palindrome (8662668).

The spelling of 3661005 in words is "three million, six hundred sixty-one thousand, five".