18133830 has 96 divisors (see below), whose sum is σ = 55429920. Its totient is φ = 4055040.

The previous prime is 18133813. The next prime is 18133877. The reversal of 18133830 is 3833181.

It is a junction number, because it is equal to n+sod(n) for n = 18133794 and 18133803.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 12166 + ... + 13574.

It is an arithmetic number, because the mean of its divisors is an integer number (577395).

Almost surely, 2^18133830 is an apocalyptic number.

18133830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18133830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27714960).

18133830 is an abundant number, since it is smaller than the sum of its proper divisors (37296090).

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

18133830 is a wasteful number, since it uses less digits than its factorization.

18133830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446 (or 1443 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 18133830 is about 4258.3834961168. The cubic root of 18133830 is about 262.7220434175.

The spelling of 18133830 in words is "eighteen million, one hundred thirty-three thousand, eight hundred thirty".