3666919 has 2 divisors, whose sum is σ = 3666920. Its totient is φ = 3666918.

The previous prime is 3666907. The next prime is 3666947. The reversal of 3666919 is 9196663.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3666919 is a prime.

It is a super-2 number, since 2×3666919² = 26892589905122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3666979) 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 as a sum of consecutive naturals, namely, 1833459 + 1833460.

It is an arithmetic number, because the mean of its divisors is an integer number (1833460).

Almost surely, 2^3666919 is an apocalyptic number.

3666919 is a deficient number, since it is larger than the sum of its proper divisors (1).

3666919 is an equidigital number, since it uses as much as digits as its factorization.

3666919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52488, while the sum is 40.

The square root of 3666919 is about 1914.9201027719. The cubic root of 3666919 is about 154.2057041959.

The spelling of 3666919 in words is "three million, six hundred sixty-six thousand, nine hundred nineteen".