42181836 has 12 divisors (see below), whose sum is σ = 98424312. Its totient is φ = 14060608.

The previous prime is 42181823. The next prime is 42181847. The reversal of 42181836 is 63818124.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 42181797 and 42181806.

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 3 ways as a sum of consecutive naturals, for example, 1757565 + ... + 1757588.

It is an arithmetic number, because the mean of its divisors is an integer number (8202026).

Almost surely, 2^42181836 is an apocalyptic number.

It is an amenable number.

42181836 is an abundant number, since it is smaller than the sum of its proper divisors (56242476).

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

42181836 is a wasteful number, since it uses less digits than its factorization.

42181836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3515160 (or 3515158 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 42181836 is about 6494.7544988244. The cubic root of 42181836 is about 348.1035825886.

The spelling of 42181836 in words is "forty-two million, one hundred eighty-one thousand, eight hundred thirty-six".