40031720 has 16 divisors (see below), whose sum is σ = 90071460. Its totient is φ = 16012672.

The previous prime is 40031713. The next prime is 40031729. The reversal of 40031720 is 2713004.

It is a happy number.

40031720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 38962564 + 1069156 = 6242^2 + 1034^2 .

It is a super-3 number, since 3×40031720³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (40031729) 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 3 ways as a sum of consecutive naturals, for example, 500357 + ... + 500436.

Almost surely, 2^40031720 is an apocalyptic number.

40031720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40031720 is an abundant number, since it is smaller than the sum of its proper divisors (50039740).

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

40031720 is a wasteful number, since it uses less digits than its factorization.

40031720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000804 (or 1000800 counting only the distinct ones).

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

The square root of 40031720 is about 6327.0625095695. The cubic root of 40031720 is about 342.0855661783.

Adding to 40031720 its reverse (2713004), we get a palindrome (42744724).

The spelling of 40031720 in words is "forty million, thirty-one thousand, seven hundred twenty".