181486980 has 144 divisors (see below), whose sum is σ = 577886400. Its totient is φ = 47806848.

The previous prime is 181486967. The next prime is 181487003. The reversal of 181486980 is 89684181.

181486980 is a `hidden beast` number, since 1 + 81 + 486 + 98 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 519846 + ... + 520194.

It is an arithmetic number, because the mean of its divisors is an integer number (4013100).

Almost surely, 2^181486980 is an apocalyptic number.

181486980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181486980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288943200).

181486980 is an abundant number, since it is smaller than the sum of its proper divisors (396399420).

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

181486980 is a wasteful number, since it uses less digits than its factorization.

181486980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480 (or 466 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The square root of 181486980 is about 13471.7103591192. The cubic root of 181486980 is about 566.1721352519.

The spelling of 181486980 in words is "one hundred eighty-one million, four hundred eighty-six thousand, nine hundred eighty".