40408685 has 4 divisors (see below), whose sum is σ = 48490428. Its totient is φ = 32326944.

The previous prime is 40408637. The next prime is 40408703. The reversal of 40408685 is 58680404.

40408685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9916201 + 30492484 = 3149^2 + 5522^2 .

It is a cyclic number.

It is not a de Polignac number, because 40408685 - 2⁸ = 40408429 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 4040864 + ... + 4040873.

It is an arithmetic number, because the mean of its divisors is an integer number (12122607).

Almost surely, 2^40408685 is an apocalyptic number.

It is an amenable number.

40408685 is a deficient number, since it is larger than the sum of its proper divisors (8081743).

40408685 is an equidigital number, since it uses as much as digits as its factorization.

40408685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8081742.

The product of its (nonzero) digits is 30720, while the sum is 35.

The square root of 40408685 is about 6356.7825981388. The cubic root of 40408685 is about 343.1559808147.

The spelling of 40408685 in words is "forty million, four hundred eight thousand, six hundred eighty-five".