3666505 has 4 divisors (see below), whose sum is σ = 4399812. Its totient is φ = 2933200.

The previous prime is 3666493. The next prime is 3666521. The reversal of 3666505 is 5056663.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 383161 + 3283344 = 619^2 + 1812^2 .

It is not a de Polignac number, because 3666505 - 2⁵ = 3666473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 366646 + ... + 366655.

It is an arithmetic number, because the mean of its divisors is an integer number (1099953).

Almost surely, 2^3666505 is an apocalyptic number.

It is an amenable number.

3666505 is a deficient number, since it is larger than the sum of its proper divisors (733307).

3666505 is an equidigital number, since it uses as much as digits as its factorization.

3666505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733306.

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 3666505 is about 1914.8120012158. The cubic root of 3666505 is about 154.1999006349.

The spelling of 3666505 in words is "three million, six hundred sixty-six thousand, five hundred five".