40649609 has 16 divisors (see below), whose sum is σ = 54579840. Its totient is φ = 29237760.

The previous prime is 40649599. The next prime is 40649611. The reversal of 40649609 is 90694604.

It is a cyclic number.

It is not a de Polignac number, because 40649609 - 2⁸ = 40649353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40649629) 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, 19304 + ... + 21305.

It is an arithmetic number, because the mean of its divisors is an integer number (3411240).

Almost surely, 2^40649609 is an apocalyptic number.

It is an amenable number.

40649609 is a deficient number, since it is larger than the sum of its proper divisors (13930231).

40649609 is a wasteful number, since it uses less digits than its factorization.

40649609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40640.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 40649609 is about 6375.7045885141. The cubic root of 40649609 is about 343.8366162337.

The spelling of 40649609 in words is "forty million, six hundred forty-nine thousand, six hundred nine".