18421230 has 16 divisors (see below), whose sum is σ = 44211024. Its totient is φ = 4912320.

The previous prime is 18421201. The next prime is 18421237. The reversal of 18421230 is 3212481.

It is a junction number, because it is equal to n+sod(n) for n = 18421197 and 18421206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18421237) 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 7 ways as a sum of consecutive naturals, for example, 306991 + ... + 307050.

It is an arithmetic number, because the mean of its divisors is an integer number (2763189).

Almost surely, 2^18421230 is an apocalyptic number.

18421230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18421230 is an abundant number, since it is smaller than the sum of its proper divisors (25789794).

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

18421230 is a wasteful number, since it uses less digits than its factorization.

18421230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614051.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 18421230 is about 4291.9960391408. The cubic root of 18421230 is about 264.1027205871.

The spelling of 18421230 in words is "eighteen million, four hundred twenty-one thousand, two hundred thirty".