31424 has 14 divisors (see below), whose sum is σ = 62484. Its totient is φ = 15680.

The previous prime is 31397. The next prime is 31469. The reversal of 31424 is 42413.

It is a nialpdrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 31399 and 31408.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 31424.

It is an unprimeable number.

31424 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182 + ... + 309.

2³¹⁴²⁴ is an apocalyptic number.

It is an amenable number.

31424 is a deficient number, since it is larger than the sum of its proper divisors (31060).

31424 is an equidigital number, since it uses as much as digits as its factorization.

31424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503 (or 493 counting only the distinct ones).

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

The square root of 31424 is about 177.2681584493. The cubic root of 31424 is about 31.5563784161.

Adding to 31424 its reverse (42413), we get a palindrome (73837).

The spelling of 31424 in words is "thirty-one thousand, four hundred twenty-four".