42161858 has 16 divisors (see below), whose sum is σ = 65855160. Its totient is φ = 20227200.

The previous prime is 42161851. The next prime is 42161869. The reversal of 42161858 is 85816124.

It can be written as a sum of positive squares in 4 ways, for example, as 6723649 + 35438209 = 2593^2 + 5953^2 .

It is not an unprimeable number, because it can be changed into a prime (42161851) 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, 788 + ... + 9216.

Almost surely, 2^42161858 is an apocalyptic number.

42161858 is a deficient number, since it is larger than the sum of its proper divisors (23693302).

42161858 is a wasteful number, since it uses less digits than its factorization.

42161858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8533.

The product of its digits is 15360, while the sum is 35.

The square root of 42161858 is about 6493.2163062692. The cubic root of 42161858 is about 348.0486180808.

The spelling of 42161858 in words is "forty-two million, one hundred sixty-one thousand, eight hundred fifty-eight".