31423 has 6 divisors (see below), whose sum is σ = 36456.
Its totient is φ = 26532.
The previous prime is 31397. The next prime is 31469. The reversal of 31423 is 32413.
Adding to 31423 its reverse (32413), we get a palindrome (63836).
Subtracting 31423 from its reverse (32413), we obtain a triangular number (990 = T44).
It can be divided in two parts, 31 and 423, that added together give a palindrome (454).
It is not a de Polignac number, because 31423 - 25 = 31391 is a prime.
It is a plaindrome in base 16.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (31123) 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, 436 + ... + 502.
It is an arithmetic number, because the mean of its divisors is an integer number (6076).
231423 is an apocalyptic number.
31423 is a deficient number, since it is larger than the sum of its proper divisors (5033).
31423 is an frugal number, since it uses more digits than its factorization.
31423 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 141 (or 74 counting only the distinct ones).
The product of its digits is 72, while the sum is 13.
The square root of 31423 is about 177.2653378413.
The cubic root of 31423 is about 31.5560436750.
The spelling of 31423 in words is "thirty-one thousand, four hundred twenty-three".