40999565 has 4 divisors (see below), whose sum is σ = 49199484. Its totient is φ = 32799648.

The previous prime is 40999561. The next prime is 40999573. The reversal of 40999565 is 56599904.

40999565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14969161 + 26030404 = 3869^2 + 5102^2 .

It is a cyclic number.

It is not a de Polignac number, because 40999565 - 2² = 40999561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40999561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4099952 + ... + 4099961.

It is an arithmetic number, because the mean of its divisors is an integer number (12299871).

Almost surely, 2^40999565 is an apocalyptic number.

It is an amenable number.

40999565 is a deficient number, since it is larger than the sum of its proper divisors (8199919).

40999565 is an equidigital number, since it uses as much as digits as its factorization.

40999565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8199918.

The product of its (nonzero) digits is 437400, while the sum is 47.

The square root of 40999565 is about 6403.0902695495. The cubic root of 40999565 is about 344.8205045425.

The spelling of 40999565 in words is "forty million, nine hundred ninety-nine thousand, five hundred sixty-five".