3891228 has 48 divisors (see below), whose sum is σ = 10160640. Its totient is φ = 1148800.

The previous prime is 3891203. The next prime is 3891229. The reversal of 3891228 is 8221983.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3891229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5053 + ... + 5771.

It is an arithmetic number, because the mean of its divisors is an integer number (211680).

Almost surely, 2^3891228 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3891228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5080320).

3891228 is an abundant number, since it is smaller than the sum of its proper divisors (6269412).

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

3891228 is a wasteful number, since it uses less digits than its factorization.

3891228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778 (or 776 counting only the distinct ones).

The product of its digits is 6912, while the sum is 33.

The square root of 3891228 is about 1972.6195781245. The cubic root of 3891228 is about 157.2879888638.

The spelling of 3891228 in words is "three million, eight hundred ninety-one thousand, two hundred twenty-eight".