40564187 has 4 divisors (see below), whose sum is σ = 40832976. Its totient is φ = 40295400.

The previous prime is 40564177. The next prime is 40564189. The reversal of 40564187 is 78146504.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40564187 - 2⁴ = 40564171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40564189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134168 + ... + 134469.

It is an arithmetic number, because the mean of its divisors is an integer number (10208244).

Almost surely, 2^40564187 is an apocalyptic number.

40564187 is a deficient number, since it is larger than the sum of its proper divisors (268789).

40564187 is a wasteful number, since it uses less digits than its factorization.

40564187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268788.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 40564187 is about 6369.0020411364. The cubic root of 40564187 is about 343.5955986693.

The spelling of 40564187 in words is "forty million, five hundred sixty-four thousand, one hundred eighty-seven".