40866815 has 16 divisors (see below), whose sum is σ = 56315520. Its totient is φ = 28156320.

The previous prime is 40866811. The next prime is 40866817. The reversal of 40866815 is 51866804.

It is not a de Polignac number, because 40866815 - 2² = 40866811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40866811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18509 + ... + 20598.

It is an arithmetic number, because the mean of its divisors is an integer number (3519720).

Almost surely, 2^40866815 is an apocalyptic number.

40866815 is a deficient number, since it is larger than the sum of its proper divisors (15448705).

40866815 is a wasteful number, since it uses less digits than its factorization.

40866815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39142.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 40866815 is about 6392.7157765695. The cubic root of 40866815 is about 344.4479443703.

It can be divided in two parts, 4086 and 6815, that added together give a palindrome (10901).

The spelling of 40866815 in words is "forty million, eight hundred sixty-six thousand, eight hundred fifteen".