42831 has 6 divisors (see below), whose sum is σ = 61880. Its totient is φ = 28548.

The previous prime is 42829. The next prime is 42839. The reversal of 42831 is 13824.

It is a happy number.

It is not a de Polignac number, because 42831 - 2¹ = 42829 is a prime.

It is a super-2 number, since 2×42831² = 3668989122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42839) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2371 + ... + 2388.

2⁴²⁸³¹ is an apocalyptic number.

42831 is a deficient number, since it is larger than the sum of its proper divisors (19049).

42831 is a wasteful number, since it uses less digits than its factorization.

42831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4765 (or 4762 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 42831 is about 206.9565171721. The cubic root of 42831 is about 34.9880231129.

Adding to 42831 its sum of digits (18), we get a square (42849 = 207²).

The spelling of 42831 in words is "forty-two thousand, eight hundred thirty-one".