181788130 has 8 divisors (see below), whose sum is σ = 327218652. Its totient is φ = 72715248.

The previous prime is 181788127. The next prime is 181788149. The reversal of 181788130 is 31887181.

It can be written as a sum of positive squares in 2 ways, for example, as 175483009 + 6305121 = 13247^2 + 2511^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 181788130.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9089397 + ... + 9089416.

Almost surely, 2^181788130 is an apocalyptic number.

181788130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181788130 is a deficient number, since it is larger than the sum of its proper divisors (145430522).

181788130 is a wasteful number, since it uses less digits than its factorization.

181788130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18178820.

The product of its (nonzero) digits is 10752, while the sum is 37.

The square root of 181788130 is about 13482.8828519720. The cubic root of 181788130 is about 566.4851210054.

The spelling of 181788130 in words is "one hundred eighty-one million, seven hundred eighty-eight thousand, one hundred thirty".