42181842 has 32 divisors (see below), whose sum is σ = 87070464. Its totient is φ = 13616000.

The previous prime is 42181823. The next prime is 42181847. The reversal of 42181842 is 24818124.

It is not an unprimeable number, because it can be changed into a prime (42181847) 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 15 ways as a sum of consecutive naturals, for example, 27742 + ... + 29222.

It is an arithmetic number, because the mean of its divisors is an integer number (2720952).

Almost surely, 2^42181842 is an apocalyptic number.

42181842 is an abundant number, since it is smaller than the sum of its proper divisors (44888622).

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

42181842 is a wasteful number, since it uses less digits than its factorization.

42181842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634.

The product of its digits is 4096, while the sum is 30.

The square root of 42181842 is about 6494.7549607356. The cubic root of 42181842 is about 348.1035990935.

Adding to 42181842 its reverse (24818124), we get a palindrome (66999966).

The spelling of 42181842 in words is "forty-two million, one hundred eighty-one thousand, eight hundred forty-two".