3849943921 has 2 divisors, whose sum is σ = 3849943922. Its totient is φ = 3849943920.

The previous prime is 3849943817. The next prime is 3849943927. The reversal of 3849943921 is 1293499483.

It is a happy number.

3849943921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1926244321 + 1923699600 = 43889^2 + 43860^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3849943921 is a prime.

It is not a weakly prime, because it can be changed into another prime (3849943927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1924971960 + 1924971961.

It is an arithmetic number, because the mean of its divisors is an integer number (1924971961).

Almost surely, 2^3849943921 is an apocalyptic number.

It is an amenable number.

3849943921 is a deficient number, since it is larger than the sum of its proper divisors (1).

3849943921 is an equidigital number, since it uses as much as digits as its factorization.

3849943921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1679616, while the sum is 52.

The square root of 3849943921 is about 62047.9163308487. The cubic root of 3849943921 is about 1567.2975974281.

The spelling of 3849943921 in words is "three billion, eight hundred forty-nine million, nine hundred forty-three thousand, nine hundred twenty-one".