18394480 has 80 divisors (see below), whose sum is σ = 48121920. Its totient is φ = 6488064.

The previous prime is 18394469. The next prime is 18394499. The reversal of 18394480 is 8449381.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23536 + ... + 24304.

It is an arithmetic number, because the mean of its divisors is an integer number (601524).

Almost surely, 2^18394480 is an apocalyptic number.

18394480 is a gapful number since it is divisible by the number (10) 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 18394480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24060960).

18394480 is an abundant number, since it is smaller than the sum of its proper divisors (29727440).

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

18394480 is a wasteful number, since it uses less digits than its factorization.

18394480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818 (or 812 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 18394480 is about 4288.8786413234. The cubic root of 18394480 is about 263.9748215963.

The spelling of 18394480 in words is "eighteen million, three hundred ninety-four thousand, four hundred eighty".