3868649 has 2 divisors, whose sum is σ = 3868650. Its totient is φ = 3868648.

The previous prime is 3868619. The next prime is 3868679. The reversal of 3868649 is 9468683.

It is a balanced prime because it is at equal distance from previous prime (3868619) and next prime (3868679).

It can be written as a sum of positive squares in only one way, i.e., 3115225 + 753424 = 1765^2 + 868^2 .

It is a cyclic number.

It is not a de Polignac number, because 3868649 - 2¹⁶ = 3803113 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (3868619) 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, 1934324 + 1934325.

It is an arithmetic number, because the mean of its divisors is an integer number (1934325).

Almost surely, 2^3868649 is an apocalyptic number.

It is an amenable number.

3868649 is a deficient number, since it is larger than the sum of its proper divisors (1).

3868649 is an equidigital number, since it uses as much as digits as its factorization.

3868649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 44.

The square root of 3868649 is about 1966.8881513701. Note that the first 3 decimals coincide. The cubic root of 3868649 is about 156.9831753375.

The spelling of 3868649 in words is "three million, eight hundred sixty-eight thousand, six hundred forty-nine".