40689305 has 4 divisors (see below), whose sum is σ = 48827172. Its totient is φ = 32551440.

The previous prime is 40689293. The next prime is 40689353. The reversal of 40689305 is 50398604.

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 20286016 + 20403289 = 4504^2 + 4517^2 .

It is not a de Polignac number, because 40689305 - 2⁴ = 40689289 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, 4068926 + ... + 4068935.

It is an arithmetic number, because the mean of its divisors is an integer number (12206793).

Almost surely, 2^40689305 is an apocalyptic number.

It is an amenable number.

40689305 is a deficient number, since it is larger than the sum of its proper divisors (8137867).

40689305 is an equidigital number, since it uses as much as digits as its factorization.

40689305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8137866.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 40689305 is about 6378.8168965726. The cubic root of 40689305 is about 343.9485033108.

The spelling of 40689305 in words is "forty million, six hundred eighty-nine thousand, three hundred five".