181896330 has 128 divisors (see below), whose sum is σ = 555724800. Its totient is φ = 37773120.

The previous prime is 181896317. The next prime is 181896347. The reversal of 181896330 is 33698181.

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 63 ways as a sum of consecutive naturals, for example, 112387 + ... + 113993.

It is an arithmetic number, because the mean of its divisors is an integer number (4341600).

Almost surely, 2^181896330 is an apocalyptic number.

181896330 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 181896330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277862400).

181896330 is an abundant number, since it is smaller than the sum of its proper divisors (373828470).

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

181896330 is a wasteful number, since it uses less digits than its factorization.

181896330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1649 (or 1635 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 181896330 is about 13486.8947500898. The cubic root of 181896330 is about 566.5974890562.

The spelling of 181896330 in words is "one hundred eighty-one million, eight hundred ninety-six thousand, three hundred thirty".