3898021849 has 2 divisors, whose sum is σ = 3898021850. Its totient is φ = 3898021848.

The previous prime is 3898021789. The next prime is 3898021859. The reversal of 3898021849 is 9481208983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3314074624 + 583947225 = 57568^2 + 24165^2 .

It is an emirp because it is prime and its reverse (9481208983) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3898021849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3898021796 and 3898021805.

It is not a weakly prime, because it can be changed into another prime (3898021859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1949010924 + 1949010925.

It is an arithmetic number, because the mean of its divisors is an integer number (1949010925).

Almost surely, 2^3898021849 is an apocalyptic number.

It is an amenable number.

3898021849 is a deficient number, since it is larger than the sum of its proper divisors (1).

3898021849 is an equidigital number, since it uses as much as digits as its factorization.

3898021849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 52.

The square root of 3898021849 is about 62434.1400917799. The cubic root of 3898021849 is about 1573.7947408390.

The spelling of 3898021849 in words is "three billion, eight hundred ninety-eight million, twenty-one thousand, eight hundred forty-nine".