40868869 has 2 divisors, whose sum is σ = 40868870. Its totient is φ = 40868868.

The previous prime is 40868813. The next prime is 40868873. The reversal of 40868869 is 96886804.

40868869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27436644 + 13432225 = 5238^2 + 3665^2 .

It is a cyclic number.

It is not a de Polignac number, because 40868869 - 2¹¹ = 40866821 is a prime.

It is a super-2 number, since 2×40868869² = 3340528906678322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40868369) 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, 20434434 + 20434435.

It is an arithmetic number, because the mean of its divisors is an integer number (20434435).

Almost surely, 2^40868869 is an apocalyptic number.

It is an amenable number.

40868869 is a deficient number, since it is larger than the sum of its proper divisors (1).

40868869 is an equidigital number, since it uses as much as digits as its factorization.

40868869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 663552, while the sum is 49.

The square root of 40868869 is about 6392.8764261481. The cubic root of 40868869 is about 344.4537150201.

The spelling of 40868869 in words is "forty million, eight hundred sixty-eight thousand, eight hundred sixty-nine".