181440005 has 8 divisors (see below), whose sum is σ = 222791712. Its totient is φ = 141776208.

The previous prime is 181439981. The next prime is 181440043. The reversal of 181440005 is 500044181.

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

It is a cyclic number.

It is not a de Polignac number, because 181440005 - 2²² = 177245701 is a prime.

It is a Duffinian number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 421739 + ... + 422168.

It is an arithmetic number, because the mean of its divisors is an integer number (27848964).

Almost surely, 2^181440005 is an apocalyptic number.

It is an amenable number.

181440005 is a deficient number, since it is larger than the sum of its proper divisors (41351707).

181440005 is an equidigital number, since it uses as much as digits as its factorization.

181440005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843955.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 181440005 is about 13469.9667779843. The cubic root of 181440005 is about 566.1232828383.

Adding to 181440005 its reverse (500044181), we get a palindrome (681484186).

The spelling of 181440005 in words is "one hundred eighty-one million, four hundred forty thousand, five".