31286412 has 60 divisors (see below), whose sum is σ = 83182176. Its totient is φ = 10251360.

The previous prime is 31286401. The next prime is 31286429. The reversal of 31286412 is 21468213.

31286412 is a `hidden beast` number, since 3 + 12 + 8 + 641 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18973 + ... + 20555.

Almost surely, 2^31286412 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31286412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41591088).

31286412 is an abundant number, since it is smaller than the sum of its proper divisors (51895764).

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

31286412 is a wasteful number, since it uses less digits than its factorization.

31286412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660 (or 1649 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 31286412 is about 5593.4257839002. The cubic root of 31286412 is about 315.1025516436.

The spelling of 31286412 in words is "thirty-one million, two hundred eighty-six thousand, four hundred twelve".