3898865784 has 64 divisors (see below), whose sum is σ = 10976302080. Its totient is φ = 1143360000.

The previous prime is 3898865779. The next prime is 3898865791. The reversal of 3898865784 is 4875688983.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 230017 + ... + 246384.

It is an arithmetic number, because the mean of its divisors is an integer number (171504720).

Almost surely, 2^3898865784 is an apocalyptic number.

It is an amenable number.

3898865784 is an abundant number, since it is smaller than the sum of its proper divisors (7077436296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3898865784 is a wasteful number, since it uses less digits than its factorization.

3898865784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476452 (or 476448 counting only the distinct ones).

The product of its digits is 92897280, while the sum is 66.

The square root of 3898865784 is about 62440.8983279389. The cubic root of 3898865784 is about 1573.9083099497.

The spelling of 3898865784 in words is "three billion, eight hundred ninety-eight million, eight hundred sixty-five thousand, seven hundred eighty-four".