3898338661 has 32 divisors (see below), whose sum is σ = 4768358400. Its totient is φ = 3112836480.

The previous prime is 3898338649. The next prime is 3898338707. The reversal of 3898338661 is 1668338983.

It is a cyclic number.

It is not a de Polignac number, because 3898338661 - 2¹⁹ = 3897814373 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 (3898330661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3267081 + ... + 3268273.

It is an arithmetic number, because the mean of its divisors is an integer number (149011200).

Almost surely, 2^3898338661 is an apocalyptic number.

It is an amenable number.

3898338661 is a deficient number, since it is larger than the sum of its proper divisors (870019739).

3898338661 is a wasteful number, since it uses less digits than its factorization.

3898338661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609.

The product of its digits is 4478976, while the sum is 55.

The square root of 3898338661 is about 62436.6772097939. The cubic root of 3898338661 is about 1573.8373764434.

The spelling of 3898338661 in words is "three billion, eight hundred ninety-eight million, three hundred thirty-eight thousand, six hundred sixty-one".