40645069 has 2 divisors, whose sum is σ = 40645070. Its totient is φ = 40645068.

The previous prime is 40645067. The next prime is 40645103. The reversal of 40645069 is 96054604.

40645069 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (40645103) can be obtained adding 40645069 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35640900 + 5004169 = 5970^2 + 2237^2 .

It is a cyclic number.

It is not a de Polignac number, because 40645069 - 2¹ = 40645067 is a prime.

It is a super-2 number, since 2×40645069² = 3304043268029522, which contains 22 as substring.

Together with 40645067, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40645067) 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 as a sum of consecutive naturals, namely, 20322534 + 20322535.

It is an arithmetic number, because the mean of its divisors is an integer number (20322535).

Almost surely, 2^40645069 is an apocalyptic number.

It is an amenable number.

40645069 is a deficient number, since it is larger than the sum of its proper divisors (1).

40645069 is an equidigital number, since it uses as much as digits as its factorization.

40645069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 40645069 is about 6375.3485394918. The cubic root of 40645069 is about 343.8238151564.

The spelling of 40645069 in words is "forty million, six hundred forty-five thousand, sixty-nine".