42181005 has 32 divisors (see below), whose sum is σ = 69890688. Its totient is φ = 21708800.

The previous prime is 42181001. The next prime is 42181019. The reversal of 42181005 is 50018124.

It is not a de Polignac number, because 42181005 - 2² = 42181001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42181001) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 65485 + ... + 66125.

It is an arithmetic number, because the mean of its divisors is an integer number (2184084).

Almost surely, 2^42181005 is an apocalyptic number.

It is an amenable number.

42181005 is a deficient number, since it is larger than the sum of its proper divisors (27709683).

42181005 is a wasteful number, since it uses less digits than its factorization.

42181005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 42181005 is about 6494.6905238048. The cubic root of 42181005 is about 348.1012966444.

Adding to 42181005 its reverse (50018124), we get a palindrome (92199129).

The spelling of 42181005 in words is "forty-two million, one hundred eighty-one thousand, five".