31224642 has 8 divisors (see below), whose sum is σ = 62449296. Its totient is φ = 10408212.

The previous prime is 31224623. The next prime is 31224647. The reversal of 31224642 is 24642213.

It is a sphenic number, since it is the product of 3 distinct primes.

31224642 is an admirable number.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (31224647) 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, 2602048 + ... + 2602059.

It is an arithmetic number, because the mean of its divisors is an integer number (7806162).

Almost surely, 2^31224642 is an apocalyptic number.

31224642 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31224642 is a wasteful number, since it uses less digits than its factorization.

31224642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5204112.

The product of its digits is 2304, while the sum is 24.

The square root of 31224642 is about 5587.9013949783. The cubic root of 31224642 is about 314.8950418773.

Adding to 31224642 its reverse (24642213), we get a palindrome (55866855).

The spelling of 31224642 in words is "thirty-one million, two hundred twenty-four thousand, six hundred forty-two".