31240212 has 24 divisors (see below), whose sum is σ = 73096800. Its totient is φ = 10384416.

The previous prime is 31240211. The next prime is 31240229. The reversal of 31240212 is 21204213.

It is a junction number, because it is equal to n+sod(n) for n = 31240191 and 31240200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31240211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1114 + ... + 7982.

It is an arithmetic number, because the mean of its divisors is an integer number (3045700).

Almost surely, 2^31240212 is an apocalyptic number.

It is an amenable number.

31240212 is an abundant number, since it is smaller than the sum of its proper divisors (41856588).

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

31240212 is a wasteful number, since it uses less digits than its factorization.

31240212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7255 (or 7253 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 31240212 is about 5589.2944098517. The cubic root of 31240212 is about 314.9473734204.

Adding to 31240212 its reverse (21204213), we get a palindrome (52444425).

The spelling of 31240212 in words is "thirty-one million, two hundred forty thousand, two hundred twelve".