31223424 has 64 divisors (see below), whose sum is σ = 87834240. Its totient is φ = 9793536.

The previous prime is 31223419. The next prime is 31223429. The reversal of 31223424 is 42432213.

It is an interprime number because it is at equal distance from previous prime (31223419) and next prime (31223429).

It is a tau number, because it is divible by the number of its divisors (64).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 31223424.

It is not an unprimeable number, because it can be changed into a prime (31223429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4137 + ... + 8919.

It is an arithmetic number, because the mean of its divisors is an integer number (1372410).

Almost surely, 2^31223424 is an apocalyptic number.

31223424 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31223424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43917120).

31223424 is an abundant number, since it is smaller than the sum of its proper divisors (56610816).

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

31223424 is a wasteful number, since it uses less digits than its factorization.

31223424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4817 (or 4805 counting only the distinct ones).

The product of its digits is 1152, while the sum is 21.

The square root of 31223424 is about 5587.7924084561. The cubic root of 31223424 is about 314.8909473853.

Adding to 31223424 its reverse (42432213), we get a palindrome (73655637).

The spelling of 31223424 in words is "thirty-one million, two hundred twenty-three thousand, four hundred twenty-four".