3865604849 has 2 divisors, whose sum is σ = 3865604850. Its totient is φ = 3865604848.

The previous prime is 3865604807. The next prime is 3865604903. The reversal of 3865604849 is 9484065683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2460854449 + 1404750400 = 49607^2 + 37480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3865604849 is a prime.

It is a super-2 number, since 2×3865604849² = 29885801697224625602, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3865604849.

It is not a weakly prime, because it can be changed into another prime (3865601849) 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, 1932802424 + 1932802425.

It is an arithmetic number, because the mean of its divisors is an integer number (1932802425).

Almost surely, 2^3865604849 is an apocalyptic number.

It is an amenable number.

3865604849 is a deficient number, since it is larger than the sum of its proper divisors (1).

3865604849 is an equidigital number, since it uses as much as digits as its factorization.

3865604849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4976640, while the sum is 53.

The square root of 3865604849 is about 62173.9885241409. The cubic root of 3865604849 is about 1569.4198904828.

The spelling of 3865604849 in words is "three billion, eight hundred sixty-five million, six hundred four thousand, eight hundred forty-nine".