40000720 has 20 divisors (see below), whose sum is σ = 93001860. Its totient is φ = 16000256.

The previous prime is 40000717. The next prime is 40000721. The reversal of 40000720 is 2700004.

It can be written as a sum of positive squares in 2 ways, for example, as 13868176 + 26132544 = 3724^2 + 5112^2 .

It is a tau number, because it is divible by the number of its divisors (20).

40000720 is a modest number, since divided by 720 gives 400 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 40000720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40000721) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 249925 + ... + 250084.

It is an arithmetic number, because the mean of its divisors is an integer number (4650093).

Almost surely, 2^40000720 is an apocalyptic number.

40000720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40000720 is an abundant number, since it is smaller than the sum of its proper divisors (53001140).

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

40000720 is a wasteful number, since it uses less digits than its factorization.

40000720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500022 (or 500016 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 13.

The square root of 40000720 is about 6324.6122410785. The cubic root of 40000720 is about 341.9972412942.

Adding to 40000720 its reverse (2700004), we get a palindrome (42700724).

The spelling of 40000720 in words is "forty million, seven hundred twenty", and thus it is an aban number.