431855 has 4 divisors (see below), whose sum is σ = 518232. Its totient is φ = 345480.

The previous prime is 431833. The next prime is 431857. The reversal of 431855 is 558134.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-431855 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431857) 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 3 ways as a sum of consecutive naturals, for example, 43181 + ... + 43190.

It is an arithmetic number, because the mean of its divisors is an integer number (129558).

2⁴³¹⁸⁵⁵ is an apocalyptic number.

431855 is a deficient number, since it is larger than the sum of its proper divisors (86377).

431855 is an equidigital number, since it uses as much as digits as its factorization.

431855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86376.

The product of its digits is 2400, while the sum is 26.

The square root of 431855 is about 657.1567545114. The cubic root of 431855 is about 75.5868042439.

Adding to 431855 its reverse (558134), we get a palindrome (989989).

The spelling of 431855 in words is "four hundred thirty-one thousand, eight hundred fifty-five".