181001730 has 64 divisors (see below), whose sum is σ = 534659328. Its totient is φ = 38188800.

The previous prime is 181001729. The next prime is 181001801. The reversal of 181001730 is 37100181.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 181001697 and 181001706.

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 31 ways as a sum of consecutive naturals, for example, 30421 + ... + 35880.

It is an arithmetic number, because the mean of its divisors is an integer number (8354052).

Almost surely, 2^181001730 is an apocalyptic number.

181001730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181001730 is an abundant number, since it is smaller than the sum of its proper divisors (353657598).

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

181001730 is a wasteful number, since it uses less digits than its factorization.

181001730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66331.

The product of its (nonzero) digits is 168, while the sum is 21.

The square root of 181001730 is about 13453.6883418637. The cubic root of 181001730 is about 565.6670847882.

The spelling of 181001730 in words is "one hundred eighty-one million, one thousand, seven hundred thirty".