3847665649 has 2 divisors, whose sum is σ = 3847665650. Its totient is φ = 3847665648.

The previous prime is 3847665643. The next prime is 3847665721. The reversal of 3847665649 is 9465667483.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1982030400 + 1865635249 = 44520^2 + 43193^2 .

It is a cyclic number.

It is not a de Polignac number, because 3847665649 - 2⁵ = 3847665617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3847665593 and 3847665602.

It is not a weakly prime, because it can be changed into another prime (3847665643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1923832824 + 1923832825.

It is an arithmetic number, because the mean of its divisors is an integer number (1923832825).

Almost surely, 2^3847665649 is an apocalyptic number.

It is an amenable number.

3847665649 is a deficient number, since it is larger than the sum of its proper divisors (1).

3847665649 is an equidigital number, since it uses as much as digits as its factorization.

3847665649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26127360, while the sum is 58.

The square root of 3847665649 is about 62029.5546413159. The cubic root of 3847665649 is about 1566.9883777888.

The spelling of 3847665649 in words is "three billion, eight hundred forty-seven million, six hundred sixty-five thousand, six hundred forty-nine".