18489320 has 32 divisors (see below), whose sum is σ = 42228000. Its totient is φ = 7284288.

The previous prime is 18489311. The next prime is 18489347. The reversal of 18489320 is 2398481.

It is a happy number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 770 + ... + 6129.

It is an arithmetic number, because the mean of its divisors is an integer number (1319625).

Almost surely, 2^18489320 is an apocalyptic number.

18489320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18489320 is an abundant number, since it is smaller than the sum of its proper divisors (23738680).

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

18489320 is a wasteful number, since it uses less digits than its factorization.

18489320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6977 (or 6973 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 18489320 is about 4299.9209295056. The cubic root of 18489320 is about 264.4277195730.

The spelling of 18489320 in words is "eighteen million, four hundred eighty-nine thousand, three hundred twenty".