42181206 has 16 divisors (see below), whose sum is σ = 84852144. Its totient is φ = 13978784.

The previous prime is 42181201. The next prime is 42181213. The reversal of 42181206 is 60218124.

It is a super-2 number, since 2×42181206² = 3558508279228872, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42181201) 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 7 ways as a sum of consecutive naturals, for example, 19281 + ... + 21356.

It is an arithmetic number, because the mean of its divisors is an integer number (5303259).

Almost surely, 2^42181206 is an apocalyptic number.

42181206 is an abundant number, since it is smaller than the sum of its proper divisors (42670938).

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

42181206 is a wasteful number, since it uses less digits than its factorization.

42181206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40815.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 42181206 is about 6494.7059979648. The cubic root of 42181206 is about 348.1018495651.

The spelling of 42181206 in words is "forty-two million, one hundred eighty-one thousand, two hundred six".