31112040 has 128 divisors (see below), whose sum is σ = 100465920. Its totient is φ = 7680000.

The previous prime is 31112033. The next prime is 31112051. The reversal of 31112040 is 4021113.

Added to its reverse (4021113) it gives a triangular number (35133153 = T₈₃₈₂).

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 205965 + ... + 206115.

It is an arithmetic number, because the mean of its divisors is an integer number (784890).

Almost surely, 2^31112040 is an apocalyptic number.

31112040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31112040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50232960).

31112040 is an abundant number, since it is smaller than the sum of its proper divisors (69353880).

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

31112040 is a wasteful number, since it uses less digits than its factorization.

31112040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 31112040 is about 5577.8167771988. The cubic root of 31112040 is about 314.5160621425.

Adding to 31112040 its reverse (4021113), we get a palindrome (35133153).

It can be divided in two parts, 3111 and 2040, that added together give a triangular number (5151 = T₁₀₁).

The spelling of 31112040 in words is "thirty-one million, one hundred twelve thousand, forty".