3949843841 has 2 divisors, whose sum is σ = 3949843842. Its totient is φ = 3949843840.

The previous prime is 3949843771. The next prime is 3949843883. The reversal of 3949843841 is 1483489493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2605081600 + 1344762241 = 51040^2 + 36671^2 .

It is an emirp because it is prime and its reverse (1483489493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3949843841 - 2¹⁰ = 3949842817 is a prime.

It is not a weakly prime, because it can be changed into another prime (3949843241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1974921920 + 1974921921.

It is an arithmetic number, because the mean of its divisors is an integer number (1974921921).

Almost surely, 2^3949843841 is an apocalyptic number.

It is an amenable number.

3949843841 is a deficient number, since it is larger than the sum of its proper divisors (1).

3949843841 is an equidigital number, since it uses as much as digits as its factorization.

3949843841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2985984, while the sum is 53.

The square root of 3949843841 is about 62847.7831033044. The cubic root of 3949843841 is about 1580.7382974021.

The spelling of 3949843841 in words is "three billion, nine hundred forty-nine million, eight hundred forty-three thousand, eight hundred forty-one".