3985798221 has 6 divisors (see below), whose sum is σ = 5757264110. Its totient is φ = 2657198808.

The previous prime is 3985798211. The next prime is 3985798241. The reversal of 3985798221 is 1228975893.

It can be written as a sum of positive squares in only one way, i.e., 2744292996 + 1241505225 = 52386^2 + 35235^2 .

It is not a de Polignac number, because 3985798221 - 2⁹ = 3985797709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3985798211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 221433226 + ... + 221433243.

Almost surely, 2^3985798221 is an apocalyptic number.

It is an amenable number.

3985798221 is a deficient number, since it is larger than the sum of its proper divisors (1771465889).

3985798221 is a wasteful number, since it uses less digits than its factorization.

3985798221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442866475 (or 442866472 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 3985798221 is about 63133.1784484197. The cubic root of 3985798221 is about 1585.5201643025.

The spelling of 3985798221 in words is "three billion, nine hundred eighty-five million, seven hundred ninety-eight thousand, two hundred twenty-one".