3898778984 has 32 divisors (see below), whose sum is σ = 7576208640. Its totient is φ = 1878960000.

The previous prime is 3898778957. The next prime is 3898778999. The reversal of 3898778984 is 4898778983.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30932 + ... + 93564.

It is an arithmetic number, because the mean of its divisors is an integer number (236756520).

Almost surely, 2^3898778984 is an apocalyptic number.

It is an amenable number.

3898778984 is a deficient number, since it is larger than the sum of its proper divisors (3677429656).

3898778984 is a wasteful number, since it uses less digits than its factorization.

3898778984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62921 (or 62917 counting only the distinct ones).

The product of its digits is 195084288, while the sum is 71.

The square root of 3898778984 is about 62440.2032668056. The cubic root of 3898778984 is about 1573.8966299498.

Subtracting 3898778984 from its reverse (4898778983), we obtain a palindrome (999999999).

The spelling of 3898778984 in words is "three billion, eight hundred ninety-eight million, seven hundred seventy-eight thousand, nine hundred eighty-four".