31040340012 has 72 divisors (see below), whose sum is σ = 85729093632. Its totient is φ = 9391548000.

The previous prime is 31040340007. The next prime is 31040340017. The reversal of 31040340012 is 21004304013.

31040340012 is a `hidden beast` number, since 310 + 4 + 0 + 340 + 0 + 12 = 666.

It is an interprime number because it is at equal distance from previous prime (31040340007) and next prime (31040340017).

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

It is not an unprimeable number, because it can be changed into a prime (31040340017) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 195637 + ... + 316787.

It is an arithmetic number, because the mean of its divisors is an integer number (1190681856).

Almost surely, 2^31040340012 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 31040340012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42864546816).

31040340012 is an abundant number, since it is smaller than the sum of its proper divisors (54688753620).

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

31040340012 is a wasteful number, since it uses less digits than its factorization.

31040340012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121819 (or 121814 counting only the distinct ones).

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

Adding to 31040340012 its reverse (21004304013), we get a palindrome (52044644025).

The spelling of 31040340012 in words is "thirty-one billion, forty million, three hundred forty thousand, twelve".