181980340 has 12 divisors (see below), whose sum is σ = 382158756. Its totient is φ = 72792128.

The previous prime is 181980311. The next prime is 181980349. The reversal of 181980340 is 43089181.

It is a happy number.

181980340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 50098084 + 131882256 = 7078^2 + 11484^2 .

It is a junction number, because it is equal to n+sod(n) for n = 181980296 and 181980305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181980349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4549489 + ... + 4549528.

It is an arithmetic number, because the mean of its divisors is an integer number (31846563).

Almost surely, 2^181980340 is an apocalyptic number.

181980340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181980340 is an abundant number, since it is smaller than the sum of its proper divisors (200178416).

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

181980340 is a wasteful number, since it uses less digits than its factorization.

181980340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9099026 (or 9099024 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 181980340 is about 13490.0088954752. The cubic root of 181980340 is about 566.6847045392.

The spelling of 181980340 in words is "one hundred eighty-one million, nine hundred eighty thousand, three hundred forty".