18479720 has 64 divisors (see below), whose sum is σ = 49075200. Its totient is φ = 6128640.

The previous prime is 18479707. The next prime is 18479729. The reversal of 18479720 is 2797481.

It is not an unprimeable number, because it can be changed into a prime (18479729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7616 + ... + 9744.

It is an arithmetic number, because the mean of its divisors is an integer number (766800).

Almost surely, 2^18479720 is an apocalyptic number.

18479720 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 18479720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24537600).

18479720 is an abundant number, since it is smaller than the sum of its proper divisors (30595480).

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

18479720 is a wasteful number, since it uses less digits than its factorization.

18479720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2178 (or 2174 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 18479720 is about 4298.8044849702. The cubic root of 18479720 is about 264.3819463810.

The spelling of 18479720 in words is "eighteen million, four hundred seventy-nine thousand, seven hundred twenty".