18813424 has 80 divisors (see below), whose sum is σ = 45372096. Its totient is φ = 7372800.

The previous prime is 18813419. The next prime is 18813449. The reversal of 18813424 is 42431881.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77944 + ... + 78184.

Almost surely, 2^18813424 is an apocalyptic number.

18813424 is a gapful number since it is divisible by the number (14) 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 18813424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22686048).

18813424 is an abundant number, since it is smaller than the sum of its proper divisors (26558672).

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

18813424 is a wasteful number, since it uses less digits than its factorization.

18813424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314 (or 308 counting only the distinct ones).

The product of its digits is 6144, while the sum is 31.

The square root of 18813424 is about 4337.4444088657. Note that the first 4 decimals coincide. The cubic root of 18813424 is about 265.9638520989.

The spelling of 18813424 in words is "eighteen million, eight hundred thirteen thousand, four hundred twenty-four".