3898647881 has 4 divisors (see below), whose sum is σ = 3899483664. Its totient is φ = 3897812100.

The previous prime is 3898647877. The next prime is 3898647889. The reversal of 3898647881 is 1887468983.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1887468983 = 6907 ⋅273269.

It is a cyclic number.

It is not a de Polignac number, because 3898647881 - 2² = 3898647877 is a prime.

It is a super-2 number, since 2×3898647881² = 30398910600051580322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3898647889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 410855 + ... + 420236.

It is an arithmetic number, because the mean of its divisors is an integer number (974870916).

Almost surely, 2^3898647881 is an apocalyptic number.

It is an amenable number.

3898647881 is a deficient number, since it is larger than the sum of its proper divisors (835783).

3898647881 is an equidigital number, since it uses as much as digits as its factorization.

3898647881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835782.

The product of its digits is 18579456, while the sum is 62.

The square root of 3898647881 is about 62439.1534295589. The cubic root of 3898647881 is about 1573.8789881117.

The spelling of 3898647881 in words is "three billion, eight hundred ninety-eight million, six hundred forty-seven thousand, eight hundred eighty-one".