31323424 has 96 divisors (see below), whose sum is σ = 72503424. Its totient is φ = 13178880.

The previous prime is 31323403. The next prime is 31323431. The reversal of 31323424 is 42432313.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 31323395 and 31323404.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 429052 + ... + 429124.

It is an arithmetic number, because the mean of its divisors is an integer number (755244).

Almost surely, 2^31323424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31323424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36251712).

31323424 is an abundant number, since it is smaller than the sum of its proper divisors (41180000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31323424 is a wasteful number, since it uses less digits than its factorization.

31323424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 162 counting only the distinct ones).

The product of its digits is 1728, while the sum is 22.

The square root of 31323424 is about 5596.7333329363. The cubic root of 31323424 is about 315.2267587030.

Adding to 31323424 its reverse (42432313), we get a palindrome (73755737).

Subtracting 31323424 from its reverse (42432313), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 3132 and 3424, that added together give a palindrome (6556).

The spelling of 31323424 in words is "thirty-one million, three hundred twenty-three thousand, four hundred twenty-four".