3979818649 has 2 divisors, whose sum is σ = 3979818650. Its totient is φ = 3979818648.

The previous prime is 3979818637. The next prime is 3979818653. The reversal of 3979818649 is 9468189793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3790618624 + 189200025 = 61568^2 + 13755^2 .

It is a cyclic number.

It is not a de Polignac number, because 3979818649 - 2⁵ = 3979818617 is a prime.

It is not a weakly prime, because it can be changed into another prime (3979818049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1989909324 + 1989909325.

It is an arithmetic number, because the mean of its divisors is an integer number (1989909325).

Almost surely, 2^3979818649 is an apocalyptic number.

It is an amenable number.

3979818649 is a deficient number, since it is larger than the sum of its proper divisors (1).

3979818649 is an equidigital number, since it uses as much as digits as its factorization.

3979818649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23514624, while the sum is 64.

The square root of 3979818649 is about 63085.8038626758. The cubic root of 3979818649 is about 1584.7268914147.

The spelling of 3979818649 in words is "three billion, nine hundred seventy-nine million, eight hundred eighteen thousand, six hundred forty-nine".