3855978889 has 8 divisors (see below), whose sum is σ = 4416874880. Its totient is φ = 3297593376.

The previous prime is 3855978869. The next prime is 3855978899. The reversal of 3855978889 is 9888795583.

3855978889 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3855978889 - 2¹⁷ = 3855847817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3855978809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 624324 + ... + 630469.

It is an arithmetic number, because the mean of its divisors is an integer number (552109360).

Almost surely, 2^3855978889 is an apocalyptic number.

It is an amenable number.

3855978889 is a deficient number, since it is larger than the sum of its proper divisors (560895991).

3855978889 is a wasteful number, since it uses less digits than its factorization.

3855978889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255239.

The product of its digits is 174182400, while the sum is 70.

The square root of 3855978889 is about 62096.5287999257. The cubic root of 3855978889 is about 1568.1161074357.

The spelling of 3855978889 in words is "three billion, eight hundred fifty-five million, nine hundred seventy-eight thousand, eight hundred eighty-nine".