3878128 has 20 divisors (see below), whose sum is σ = 7909960. Its totient is φ = 1836864.

The previous prime is 3878113. The next prime is 3878137. The reversal of 3878128 is 8218783.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6075 + ... + 6682.

It is an arithmetic number, because the mean of its divisors is an integer number (395498).

Almost surely, 2^3878128 is an apocalyptic number.

3878128 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

3878128 is an abundant number, since it is smaller than the sum of its proper divisors (4031832).

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

3878128 is a wasteful number, since it uses less digits than its factorization.

3878128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12784 (or 12778 counting only the distinct ones).

The product of its digits is 21504, while the sum is 37.

The square root of 3878128 is about 1969.2963210243. The cubic root of 3878128 is about 157.1112846448. Note that the first 3 decimals are identical.

It can be divided in two parts, 38781 and 28, that added together give a square (38809 = 197²).

The spelling of 3878128 in words is "three million, eight hundred seventy-eight thousand, one hundred twenty-eight".