18430038 has 128 divisors (see below), whose sum is σ = 49766400. Its totient is φ = 4989600.

The previous prime is 18430037. The next prime is 18430043. The reversal of 18430038 is 83003481.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18429993 and 18430020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18430037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 259543 + ... + 259613.

It is an arithmetic number, because the mean of its divisors is an integer number (388800).

Almost surely, 2^18430038 is an apocalyptic number.

18430038 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18430038, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24883200).

18430038 is an abundant number, since it is smaller than the sum of its proper divisors (31336362).

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

18430038 is a wasteful number, since it uses less digits than its factorization.

18430038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 18430038 is about 4293.0220125222. The cubic root of 18430038 is about 264.1448069209.

The spelling of 18430038 in words is "eighteen million, four hundred thirty thousand, thirty-eight".