40688709 has 16 divisors (see below), whose sum is σ = 58951680. Its totient is φ = 24868080.

The previous prime is 40688693. The next prime is 40688717. The reversal of 40688709 is 90788604.

It is a happy number.

40688709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40688709 - 2⁴ = 40688693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40688749) 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 15 ways as a sum of consecutive naturals, for example, 9747 + ... + 13280.

It is an arithmetic number, because the mean of its divisors is an integer number (3684480).

Almost surely, 2^40688709 is an apocalyptic number.

It is an amenable number.

40688709 is a deficient number, since it is larger than the sum of its proper divisors (18262971).

40688709 is a wasteful number, since it uses less digits than its factorization.

40688709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23080.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 40688709 is about 6378.7701792744. The cubic root of 40688709 is about 343.9468239645.

The spelling of 40688709 in words is "forty million, six hundred eighty-eight thousand, seven hundred nine".