40638686 has 16 divisors (see below), whose sum is σ = 68793840. Its totient is φ = 17834880.

The previous prime is 40638673. The next prime is 40638727. The reversal of 40638686 is 68683604.

40638686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 7 ways as a sum of consecutive naturals, for example, 31211 + ... + 32486.

It is an arithmetic number, because the mean of its divisors is an integer number (4299615).

Almost surely, 2^40638686 is an apocalyptic number.

40638686 is a deficient number, since it is larger than the sum of its proper divisors (28155154).

40638686 is a wasteful number, since it uses less digits than its factorization.

40638686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63739.

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 40638686 is about 6374.8479197546. The cubic root of 40638686 is about 343.8058159062.

The spelling of 40638686 in words is "forty million, six hundred thirty-eight thousand, six hundred eighty-six".