40638659 has 6 divisors (see below), whose sum is σ = 40887756. Its totient is φ = 40391040.

The previous prime is 40638629. The next prime is 40638673. The reversal of 40638659 is 95683604.

It is not a de Polignac number, because 40638659 - 2¹² = 40634563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40638629) 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 5 ways as a sum of consecutive naturals, for example, 36704 + ... + 37794.

It is an arithmetic number, because the mean of its divisors is an integer number (6814626).

Almost surely, 2^40638659 is an apocalyptic number.

40638659 is a deficient number, since it is larger than the sum of its proper divisors (249097).

40638659 is an equidigital number, since it uses as much as digits as its factorization.

40638659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1477 (or 1284 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 40638659 is about 6374.8458020567. The cubic root of 40638659 is about 343.8057397656.

The spelling of 40638659 in words is "forty million, six hundred thirty-eight thousand, six hundred fifty-nine".