40665841 has 2 divisors, whose sum is σ = 40665842. Its totient is φ = 40665840.

The previous prime is 40665839. The next prime is 40665869. The reversal of 40665841 is 14856604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31080625 + 9585216 = 5575^2 + 3096^2 .

It is a cyclic number.

It is not a de Polignac number, because 40665841 - 2¹ = 40665839 is a prime.

Together with 40665839, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 40665797 and 40665806.

It is not a weakly prime, because it can be changed into another prime (40665341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20332920 + 20332921.

It is an arithmetic number, because the mean of its divisors is an integer number (20332921).

Almost surely, 2^40665841 is an apocalyptic number.

It is an amenable number.

40665841 is a deficient number, since it is larger than the sum of its proper divisors (1).

40665841 is an equidigital number, since it uses as much as digits as its factorization.

40665841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 40665841 is about 6376.9774188090. The cubic root of 40665841 is about 343.8823765200.

The spelling of 40665841 in words is "forty million, six hundred sixty-five thousand, eight hundred forty-one".