18411228 has 72 divisors (see below), whose sum is σ = 53464320. Its totient is φ = 5283360.

The previous prime is 18411199. The next prime is 18411229. The reversal of 18411228 is 82211481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18411229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6301 + ... + 8747.

It is an arithmetic number, because the mean of its divisors is an integer number (742560).

Almost surely, 2^18411228 is an apocalyptic number.

18411228 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 18411228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26732160).

18411228 is an abundant number, since it is smaller than the sum of its proper divisors (35053092).

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

18411228 is a wasteful number, since it uses less digits than its factorization.

18411228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2487 (or 2482 counting only the distinct ones).

The product of its digits is 1024, while the sum is 27.

The square root of 18411228 is about 4290.8306888061. The cubic root of 18411228 is about 264.0549128196.

The spelling of 18411228 in words is "eighteen million, four hundred eleven thousand, two hundred twenty-eight".