42666831 has 20 divisors (see below), whose sum is σ = 64239384. Its totient is φ = 28220400.

The previous prime is 42666829. The next prime is 42666847. The reversal of 42666831 is 13866624.

42666831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42666831 - 2¹ = 42666829 is a prime.

It is a super-2 number, since 2×42666831² = 3640916935165122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42666131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8601 + ... + 12621.

Almost surely, 2^42666831 is an apocalyptic number.

42666831 is a deficient number, since it is larger than the sum of its proper divisors (21572553).

42666831 is a wasteful number, since it uses less digits than its factorization.

42666831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4164 (or 4155 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 42666831 is about 6531.9852265601. The cubic root of 42666831 is about 349.4326345139.

The spelling of 42666831 in words is "forty-two million, six hundred sixty-six thousand, eight hundred thirty-one".