31072040 has 16 divisors (see below), whose sum is σ = 69912180. Its totient is φ = 12428800.

The previous prime is 31072037. The next prime is 31072091. The reversal of 31072040 is 4027013.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28922884 + 2149156 = 5378^2 + 1466^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 388361 + ... + 388440.

Almost surely, 2^31072040 is an apocalyptic number.

It is an amenable number.

31072040 is an abundant number, since it is smaller than the sum of its proper divisors (38840140).

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

31072040 is a wasteful number, since it uses less digits than its factorization.

31072040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776812 (or 776808 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 31072040 is about 5574.2299916670. The cubic root of 31072040 is about 314.3812157627.

Adding to 31072040 its reverse (4027013), we get a palindrome (35099053).

The spelling of 31072040 in words is "thirty-one million, seventy-two thousand, forty".