31284212 has 12 divisors (see below), whose sum is σ = 55363140. Its totient is φ = 15466176.

The previous prime is 31284179. The next prime is 31284229. The reversal of 31284212 is 21248213.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15713296 + 15570916 = 3964^2 + 3946^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43583 + ... + 44294.

It is an arithmetic number, because the mean of its divisors is an integer number (4613595).

Almost surely, 2^31284212 is an apocalyptic number.

It is an amenable number.

31284212 is a deficient number, since it is larger than the sum of its proper divisors (24078928).

31284212 is a wasteful number, since it uses less digits than its factorization.

31284212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87970 (or 87968 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 31284212 is about 5593.2291209998. The cubic root of 31284212 is about 315.0951656697.

The spelling of 31284212 in words is "thirty-one million, two hundred eighty-four thousand, two hundred twelve".