181428930 has 192 divisors, whose sum is σ = 541831680. Its totient is φ = 43029504.

The previous prime is 181428917. The next prime is 181428931. The reversal of 181428930 is 39824181.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181428931) 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 95 ways as a sum of consecutive naturals, for example, 3860167 + ... + 3860213.

It is an arithmetic number, because the mean of its divisors is an integer number (2822040).

Almost surely, 2^181428930 is an apocalyptic number.

181428930 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 181428930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270915840).

181428930 is an abundant number, since it is smaller than the sum of its proper divisors (360402750).

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

181428930 is a wasteful number, since it uses less digits than its factorization.

181428930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 103 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 181428930 is about 13469.5556719589. Note that the first 3 decimals coincide. The cubic root of 181428930 is about 566.1117639840. Note that the first 3 decimals are identical.

It can be divided in two parts, 18142 and 8930, that added together give a palindrome (27072).

The spelling of 181428930 in words is "one hundred eighty-one million, four hundred twenty-eight thousand, nine hundred thirty".