181983380 has 24 divisors (see below), whose sum is σ = 385179648. Its totient is φ = 72219168.

The previous prime is 181983359. The next prime is 181983391. The reversal of 181983380 is 83389181.

It is a happy number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 33284 + ... + 38363.

It is an arithmetic number, because the mean of its divisors is an integer number (16049152).

Almost surely, 2^181983380 is an apocalyptic number.

181983380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181983380 is an abundant number, since it is smaller than the sum of its proper divisors (203196268).

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

181983380 is a wasteful number, since it uses less digits than its factorization.

181983380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71783 (or 71781 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 181983380 is about 13490.1215709867. The cubic root of 181983380 is about 566.6878600301.

The spelling of 181983380 in words is "one hundred eighty-one million, nine hundred eighty-three thousand, three hundred eighty".