40549905 has 24 divisors (see below), whose sum is σ = 76677120. Its totient is φ = 19660320.

The previous prime is 40549877. The next prime is 40549907. The reversal of 40549905 is 50994504.

40549905 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 40549905 - 2⁶ = 40549841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40549905.

It is not an unprimeable number, because it can be changed into a prime (40549907) 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 23 ways as a sum of consecutive naturals, for example, 40465 + ... + 41454.

It is an arithmetic number, because the mean of its divisors is an integer number (3194880).

Almost surely, 2^40549905 is an apocalyptic number.

40549905 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40549905 is a deficient number, since it is larger than the sum of its proper divisors (36127215).

40549905 is a wasteful number, since it uses less digits than its factorization.

40549905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81941 (or 81938 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 40549905 is about 6367.8807306670. The cubic root of 40549905 is about 343.5552691017. Note that the first 3 decimals are identical.

It can be divided in two parts, 40 and 549905, that added together give a palindrome (549945).

The spelling of 40549905 in words is "forty million, five hundred forty-nine thousand, nine hundred five".