31993212 has 12 divisors (see below), whose sum is σ = 74650856. Its totient is φ = 10664400.

The previous prime is 31993193. The next prime is 31993217. The reversal of 31993212 is 21239913.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×31993212² = 2047131228153888, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31993212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31993217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1333039 + ... + 1333062.

Almost surely, 2^31993212 is an apocalyptic number.

It is an amenable number.

31993212 is an abundant number, since it is smaller than the sum of its proper divisors (42657644).

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

31993212 is a wasteful number, since it uses less digits than its factorization.

31993212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2666108 (or 2666106 counting only the distinct ones).

The product of its digits is 2916, while the sum is 30.

The square root of 31993212 is about 5656.2542375675. The cubic root of 31993212 is about 317.4577603096.

The spelling of 31993212 in words is "thirty-one million, nine hundred ninety-three thousand, two hundred twelve".