31112440 has 64 divisors (see below), whose sum is σ = 73120320. Its totient is φ = 11904000.

The previous prime is 31112401. The next prime is 31112441. The reversal of 31112440 is 4421113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31112441) 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, 99885 + ... + 100195.

It is an arithmetic number, because the mean of its divisors is an integer number (1142505).

Almost surely, 2^31112440 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 31112440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36560160).

31112440 is an abundant number, since it is smaller than the sum of its proper divisors (42007880).

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

31112440 is a wasteful number, since it uses less digits than its factorization.

31112440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 31112440 is about 5577.8526334065. The cubic root of 31112440 is about 314.5174100224.

Adding to 31112440 its reverse (4421113), we get a palindrome (35533553).

The spelling of 31112440 in words is "thirty-one million, one hundred twelve thousand, four hundred forty".