40638566 has 8 divisors (see below), whose sum is σ = 61957344. Its totient is φ = 19986120.

The previous prime is 40638523. The next prime is 40638571. The reversal of 40638566 is 66583604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 166430 + ... + 166673.

It is an arithmetic number, because the mean of its divisors is an integer number (7744668).

Almost surely, 2^40638566 is an apocalyptic number.

40638566 is a deficient number, since it is larger than the sum of its proper divisors (21318778).

40638566 is a wasteful number, since it uses less digits than its factorization.

40638566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333166.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 40638566 is about 6374.8385077585. The cubic root of 40638566 is about 343.8054775034.

The spelling of 40638566 in words is "forty million, six hundred thirty-eight thousand, five hundred sixty-six".