31443012 has 48 divisors (see below), whose sum is σ = 82297600. Its totient is φ = 10380960.

The previous prime is 31442963. The next prime is 31443031. The reversal of 31443012 is 21034413.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 15 ways as a sum of consecutive naturals, for example, 10437 + ... + 13107.

Almost surely, 2^31443012 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 31443012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41148800).

31443012 is an abundant number, since it is smaller than the sum of its proper divisors (50854588).

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

31443012 is a wasteful number, since it uses less digits than its factorization.

31443012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2793 (or 2785 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31443012 is about 5607.4068873232. The cubic root of 31443012 is about 315.6274116340.

Adding to 31443012 its reverse (21034413), we get a palindrome (52477425).

The spelling of 31443012 in words is "thirty-one million, four hundred forty-three thousand, twelve".