3666623 has 4 divisors (see below), whose sum is σ = 3674640. Its totient is φ = 3658608.

The previous prime is 3666613. The next prime is 3666629. The reversal of 3666623 is 3266663.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3266663 = 659 ⋅4957.

It is a cyclic number.

It is not a de Polignac number, because 3666623 - 2²⁰ = 2618047 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3666623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3666629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3278 + ... + 4251.

It is an arithmetic number, because the mean of its divisors is an integer number (918660).

Almost surely, 2^3666623 is an apocalyptic number.

3666623 is a deficient number, since it is larger than the sum of its proper divisors (8017).

3666623 is an equidigital number, since it uses as much as digits as its factorization.

3666623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8016.

The product of its digits is 23328, while the sum is 32.

The square root of 3666623 is about 1914.8428133923. The cubic root of 3666623 is about 154.2015548345.

The spelling of 3666623 in words is "three million, six hundred sixty-six thousand, six hundred twenty-three".