40656169 has 2 divisors, whose sum is σ = 40656170. Its totient is φ = 40656168.

The previous prime is 40656151. The next prime is 40656191. The reversal of 40656169 is 96165604.

40656169 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31775769 + 8880400 = 5637^2 + 2980^2 .

It is a cyclic number.

It is not a de Polignac number, because 40656169 - 2¹³ = 40647977 is a prime.

It is a super-2 number, since 2×40656169² = 3305848155513122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40656149) 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, 20328084 + 20328085.

It is an arithmetic number, because the mean of its divisors is an integer number (20328085).

Almost surely, 2^40656169 is an apocalyptic number.

It is an amenable number.

40656169 is a deficient number, since it is larger than the sum of its proper divisors (1).

40656169 is an equidigital number, since it uses as much as digits as its factorization.

40656169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 40656169 is about 6376.2190207050. The cubic root of 40656169 is about 343.8551112609.

The spelling of 40656169 in words is "forty million, six hundred fifty-six thousand, one hundred sixty-nine".