40665685 has 16 divisors (see below), whose sum is σ = 50711040. Its totient is φ = 31268160.

The previous prime is 40665673. The next prime is 40665689. The reversal of 40665685 is 58656604.

It is not a de Polignac number, because 40665685 - 2¹³ = 40657493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40665689) 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 15 ways as a sum of consecutive naturals, for example, 40540 + ... + 41530.

It is an arithmetic number, because the mean of its divisors is an integer number (3169440).

Almost surely, 2^40665685 is an apocalyptic number.

It is an amenable number.

40665685 is a deficient number, since it is larger than the sum of its proper divisors (10045355).

40665685 is a wasteful number, since it uses less digits than its factorization.

40665685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308.

The product of its (nonzero) digits is 172800, while the sum is 40.

The square root of 40665685 is about 6376.9651872972. The cubic root of 40665685 is about 343.8819367921.

The spelling of 40665685 in words is "forty million, six hundred sixty-five thousand, six hundred eighty-five".