31224340 has 48 divisors (see below), whose sum is σ = 78204672. Its totient is φ = 10238976.

The previous prime is 31224313. The next prime is 31224341. The reversal of 31224340 is 4342213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31224341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1629 + ... + 8068.

It is an arithmetic number, because the mean of its divisors is an integer number (1629264).

Almost surely, 2^31224340 is an apocalyptic number.

It is an amenable number.

31224340 is an abundant number, since it is smaller than the sum of its proper divisors (46980332).

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

31224340 is a wasteful number, since it uses less digits than its factorization.

31224340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9736 (or 9734 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 31224340 is about 5587.8743722457. The cubic root of 31224340 is about 314.8940266684.

Adding to 31224340 its reverse (4342213), we get a palindrome (35566553).

The spelling of 31224340 in words is "thirty-one million, two hundred twenty-four thousand, three hundred forty".