3855506538 has 64 divisors (see below), whose sum is σ = 8583708672. Its totient is φ = 1146989760.

The previous prime is 3855506531. The next prime is 3855506561. The reversal of 3855506538 is 8356055583.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (3855506531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 297943 + ... + 310613.

It is an arithmetic number, because the mean of its divisors is an integer number (134120448).

Almost surely, 2^3855506538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3855506538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4291854336).

3855506538 is an abundant number, since it is smaller than the sum of its proper divisors (4728202134).

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

3855506538 is a wasteful number, since it uses less digits than its factorization.

3855506538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12819.

The product of its (nonzero) digits is 2160000, while the sum is 48.

The square root of 3855506538 is about 62092.7253226978. The cubic root of 3855506538 is about 1568.0520742827.

The spelling of 3855506538 in words is "three billion, eight hundred fifty-five million, five hundred six thousand, five hundred thirty-eight".