40207685 has 12 divisors (see below), whose sum is σ = 56126988. Its totient is φ = 27570816.

The previous prime is 40207681. The next prime is 40207693. The reversal of 40207685 is 58670204.

It can be written as a sum of positive squares in 2 ways, for example, as 19695844 + 20511841 = 4438^2 + 4529^2 .

It is not a de Polignac number, because 40207685 - 2² = 40207681 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40207681) 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 11 ways as a sum of consecutive naturals, for example, 81812 + ... + 82301.

It is an arithmetic number, because the mean of its divisors is an integer number (4677249).

Almost surely, 2^40207685 is an apocalyptic number.

It is an amenable number.

40207685 is a deficient number, since it is larger than the sum of its proper divisors (15919303).

40207685 is a wasteful number, since it uses less digits than its factorization.

40207685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164132 (or 164125 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 40207685 is about 6340.9530040838. The cubic root of 40207685 is about 342.5860618084.

Adding to 40207685 its reverse (58670204), we get a palindrome (98877889).

The spelling of 40207685 in words is "forty million, two hundred seven thousand, six hundred eighty-five".