18394128 has 140 divisors (see below), whose sum is σ = 56923440. Its totient is φ = 5738688.

The previous prime is 18394121. The next prime is 18394133. The reversal of 18394128 is 82149381.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

Its product of digits (13824) is a multiple of the sum of its prime factors (128).

It is a junction number, because it is equal to n+sod(n) for n = 18394092 and 18394101.

It is not an unprimeable number, because it can be changed into a prime (18394121) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 221575 + ... + 221657.

It is an arithmetic number, because the mean of its divisors is an integer number (406596).

Almost surely, 2^18394128 is an apocalyptic number.

18394128 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 18394128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28461720).

18394128 is an abundant number, since it is smaller than the sum of its proper divisors (38529312).

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

18394128 is an equidigital number, since it uses as much as digits as its factorization.

18394128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 107 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 18394128 is about 4288.8376047596. The cubic root of 18394128 is about 263.9731377627.

The spelling of 18394128 in words is "eighteen million, three hundred ninety-four thousand, one hundred twenty-eight".