181989404340 has 24 divisors (see below), whose sum is σ = 509570332320. Its totient is φ = 48530507808.

The previous prime is 181989404339. The next prime is 181989404341. The reversal of 181989404340 is 43404989181.

It is an interprime number because it is at equal distance from previous prime (181989404339) and next prime (181989404341).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181989404341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1516578310 + ... + 1516578429.

It is an arithmetic number, because the mean of its divisors is an integer number (21232097180).

Almost surely, 2^181989404340 is an apocalyptic number.

181989404340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181989404340 is an abundant number, since it is smaller than the sum of its proper divisors (327580927980).

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

181989404340 is a wasteful number, since it uses less digits than its factorization.

181989404340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3033156751 (or 3033156749 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 51.

The spelling of 181989404340 in words is "one hundred eighty-one billion, nine hundred eighty-nine million, four hundred four thousand, three hundred forty".