18994480 has 40 divisors (see below), whose sum is σ = 45247104. Its totient is φ = 7411200.

The previous prime is 18994477. The next prime is 18994487. The reversal of 18994480 is 8449981.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18994487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385 + ... + 6175.

Almost surely, 2^18994480 is an apocalyptic number.

18994480 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 18994480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22623552).

18994480 is an abundant number, since it is smaller than the sum of its proper divisors (26252624).

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

18994480 is a wasteful number, since it uses less digits than its factorization.

18994480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5845 (or 5839 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 18994480 is about 4358.2657101191. The cubic root of 18994480 is about 266.8143210059.

The spelling of 18994480 in words is "eighteen million, nine hundred ninety-four thousand, four hundred eighty".