42431 has 4 divisors (see below), whose sum is σ = 42864. Its totient is φ = 42000.

The previous prime is 42409. The next prime is 42433. The reversal of 42431 is 13424.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42431 is a prime.

It is a super-2 number, since 2×42431² = 3600779522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 8 and base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42433) 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 3 ways as a sum of consecutive naturals, for example, 11 + ... + 291.

It is an arithmetic number, because the mean of its divisors is an integer number (10716).

2⁴²⁴³¹ is an apocalyptic number.

42431 is a deficient number, since it is larger than the sum of its proper divisors (433).

42431 is a wasteful number, since it uses less digits than its factorization.

42431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432.

The product of its digits is 96, while the sum is 14.

The square root of 42431 is about 205.9878637202. The cubic root of 42431 is about 34.8787642122.

Adding to 42431 its reverse (13424), we get a palindrome (55855).

The spelling of 42431 in words is "forty-two thousand, four hundred thirty-one".