12213828 has 120 divisors (see below), whose sum is σ = 36590400. Its totient is φ = 3516480.

The previous prime is 12213823. The next prime is 12213841. The reversal of 12213828 is 82831221.

12213828 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12213821) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 81898 + ... + 82046.

It is an arithmetic number, because the mean of its divisors is an integer number (304920).

Almost surely, 2^12213828 is an apocalyptic number.

12213828 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12213828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18295200).

12213828 is an abundant number, since it is smaller than the sum of its proper divisors (24376572).

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

12213828 is a wasteful number, since it uses less digits than its factorization.

12213828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 188 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 12213828 is about 3494.8287511694. The cubic root of 12213828 is about 230.2946947157.

It can be divided in two parts, 12213 and 828, that added together give a triangular number (13041 = T₁₆₁).

The spelling of 12213828 in words is "twelve million, two hundred thirteen thousand, eight hundred twenty-eight".