31224630 has 16 divisors (see below), whose sum is σ = 74939184. Its totient is φ = 8326560.

The previous prime is 31224623. The next prime is 31224647. The reversal of 31224630 is 3642213.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31224597 and 31224606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 520381 + ... + 520440.

It is an arithmetic number, because the mean of its divisors is an integer number (4683699).

Almost surely, 2^31224630 is an apocalyptic number.

31224630 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31224630 is an abundant number, since it is smaller than the sum of its proper divisors (43714554).

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

31224630 is a wasteful number, since it uses less digits than its factorization.

31224630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040831.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 31224630 is about 5587.9003212298. The cubic root of 31224630 is about 314.8950015380.

Adding to 31224630 its reverse (3642213), we get a palindrome (34866843).

It can be divided in two parts, 312 and 24630, that added together give a palindrome (24942).

The spelling of 31224630 in words is "thirty-one million, two hundred twenty-four thousand, six hundred thirty".