40505665 has 4 divisors (see below), whose sum is σ = 48606804. Its totient is φ = 32404528.

The previous prime is 40505659. The next prime is 40505671. The reversal of 40505665 is 56650504.

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

It is an interprime number because it is at equal distance from previous prime (40505659) and next prime (40505671).

It can be written as a sum of positive squares in 2 ways, for example, as 12616704 + 27888961 = 3552^2 + 5281^2 .

It is a cyclic number.

It is not a de Polignac number, because 40505665 - 2¹⁵ = 40472897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4050562 + ... + 4050571.

It is an arithmetic number, because the mean of its divisors is an integer number (12151701).

Almost surely, 2^40505665 is an apocalyptic number.

It is an amenable number.

40505665 is a deficient number, since it is larger than the sum of its proper divisors (8101139).

40505665 is an equidigital number, since it uses as much as digits as its factorization.

40505665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8101138.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 40505665 is about 6364.4060995508. The cubic root of 40505665 is about 343.4302838866.

The spelling of 40505665 in words is "forty million, five hundred five thousand, six hundred sixty-five".