3866869 has 2 divisors, whose sum is σ = 3866870. Its totient is φ = 3866868.

The previous prime is 3866867. The next prime is 3866879. The reversal of 3866869 is 9686683.

It is a happy number.

3866869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2739025 + 1127844 = 1655^2 + 1062^2 .

It is a cyclic number.

It is not a de Polignac number, because 3866869 - 2¹ = 3866867 is a prime.

It is a super-2 number, since 2×3866869² = 29905351726322, which contains 22 as substring.

Together with 3866867, it forms a pair of twin primes.

3866869 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3866867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1933434 + 1933435.

It is an arithmetic number, because the mean of its divisors is an integer number (1933435).

Almost surely, 2^3866869 is an apocalyptic number.

It is an amenable number.

3866869 is a deficient number, since it is larger than the sum of its proper divisors (1).

3866869 is an equidigital number, since it uses as much as digits as its factorization.

3866869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 46.

The square root of 3866869 is about 1966.4356078957. The cubic root of 3866869 is about 156.9590951897.

The spelling of 3866869 in words is "three million, eight hundred sixty-six thousand, eight hundred sixty-nine".