3659861 has 2 divisors, whose sum is σ = 3659862. Its totient is φ = 3659860.

The previous prime is 3659849. The next prime is 3659917. The reversal of 3659861 is 1689563.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3010225 + 649636 = 1735^2 + 806^2 .

It is a cyclic number.

It is not a de Polignac number, because 3659861 - 2⁶ = 3659797 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3659801) by changing a digit.

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 as a sum of consecutive naturals, namely, 1829930 + 1829931.

It is an arithmetic number, because the mean of its divisors is an integer number (1829931).

Almost surely, 2^3659861 is an apocalyptic number.

It is an amenable number.

3659861 is a deficient number, since it is larger than the sum of its proper divisors (1).

3659861 is an equidigital number, since it uses as much as digits as its factorization.

3659861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 38.

The square root of 3659861 is about 1913.0763183940. The cubic root of 3659861 is about 154.1067034720.

The spelling of 3659861 in words is "three million, six hundred fifty-nine thousand, eight hundred sixty-one".