31845012 has 48 divisors (see below), whose sum is σ = 80821440. Its totient is φ = 9718272.

The previous prime is 31844999. The next prime is 31845013. The reversal of 31845012 is 21054813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31845013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5439 + ... + 9657.

It is an arithmetic number, because the mean of its divisors is an integer number (1683780).

Almost surely, 2^31845012 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 31845012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40410720).

31845012 is an abundant number, since it is smaller than the sum of its proper divisors (48976428).

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

31845012 is a wasteful number, since it uses less digits than its factorization.

31845012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4280 (or 4278 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 31845012 is about 5643.1384884654. The cubic root of 31845012 is about 316.9668220840.

Adding to 31845012 its reverse (21054813), we get a palindrome (52899825).

The spelling of 31845012 in words is "thirty-one million, eight hundred forty-five thousand, twelve".