40040720 has 20 divisors (see below), whose sum is σ = 93094860. Its totient is φ = 16016256.

The previous prime is 40040717. The next prime is 40040731. The reversal of 40040720 is 2704004.

It can be written as a sum of positive squares in 2 ways, for example, as 11182336 + 28858384 = 3344^2 + 5372^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 250175 + ... + 250334.

It is an arithmetic number, because the mean of its divisors is an integer number (4654743).

Almost surely, 2^40040720 is an apocalyptic number.

40040720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40040720 is an abundant number, since it is smaller than the sum of its proper divisors (53054140).

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

40040720 is a wasteful number, since it uses less digits than its factorization.

40040720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500522 (or 500516 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 17.

The square root of 40040720 is about 6327.7737001255. The cubic root of 40040720 is about 342.1112003454. Note that the first 3 decimals are identical.

Adding to 40040720 its reverse (2704004), we get a palindrome (42744724).

The spelling of 40040720 in words is "forty million, forty thousand, seven hundred twenty".