42105831 has 8 divisors (see below), whose sum is σ = 56179200. Its totient is φ = 28051512.

The previous prime is 42105827. The next prime is 42105841. The reversal of 42105831 is 13850124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42105831 - 2² = 42105827 is a prime.

It is a super-2 number, since 2×42105831² = 3545802008401122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42105841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1620 + ... + 9318.

It is an arithmetic number, because the mean of its divisors is an integer number (7022400).

Almost surely, 2^42105831 is an apocalyptic number.

42105831 is a deficient number, since it is larger than the sum of its proper divisors (14073369).

42105831 is a wasteful number, since it uses less digits than its factorization.

42105831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9525.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 42105831 is about 6488.9006002558. The cubic root of 42105831 is about 347.8943810140.

Adding to 42105831 its reverse (13850124), we get a palindrome (55955955).

The spelling of 42105831 in words is "forty-two million, one hundred five thousand, eight hundred thirty-one".