31041040 has 40 divisors (see below), whose sum is σ = 73542168. Its totient is φ = 12180480.

The previous prime is 31041029. The next prime is 31041061. The reversal of 31041040 is 4014013.

It can be written as a sum of positive squares in 4 ways, for example, as 82944 + 30958096 = 288^2 + 5564^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 31041040.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 580 + ... + 7900.

Almost surely, 2^31041040 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 31041040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36771084).

31041040 is an abundant number, since it is smaller than the sum of its proper divisors (42501128).

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

31041040 is a wasteful number, since it uses less digits than its factorization.

31041040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7387 (or 7381 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 31041040 is about 5571.4486446525. The cubic root of 31041040 is about 314.2766301979.

Adding to 31041040 its reverse (4014013), we get a palindrome (35055053).

The spelling of 31041040 in words is "thirty-one million, forty-one thousand, forty".