18430720 has 216 divisors, whose sum is σ = 58720032. Its totient is φ = 5406720.

The previous prime is 18430691. The next prime is 18430733. The reversal of 18430720 is 2703481.

18430720 = T₄₉₆ + T₄₉₇ + ... + T₆₁₄.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1084152 + ... + 1084168.

It is an arithmetic number, because the mean of its divisors is an integer number (271852).

Almost surely, 2^18430720 is an apocalyptic number.

18430720 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 18430720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29360016).

18430720 is an abundant number, since it is smaller than the sum of its proper divisors (40289312).

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

18430720 is a wasteful number, since it uses less digits than its factorization.

18430720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67 (or 42 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 18430720 is about 4293.1014430130. The cubic root of 18430720 is about 264.1480650899.

The spelling of 18430720 in words is "eighteen million, four hundred thirty thousand, seven hundred twenty".