40436689 has 2 divisors, whose sum is σ = 40436690. Its totient is φ = 40436688.

The previous prime is 40436677. The next prime is 40436699. The reversal of 40436689 is 98663404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35521600 + 4915089 = 5960^2 + 2217^2 .

It is a cyclic number.

It is not a de Polignac number, because 40436689 - 2¹⁹ = 39912401 is a prime.

It is not a weakly prime, because it can be changed into another prime (40436639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20218344 + 20218345.

It is an arithmetic number, because the mean of its divisors is an integer number (20218345).

Almost surely, 2^40436689 is an apocalyptic number.

It is an amenable number.

40436689 is a deficient number, since it is larger than the sum of its proper divisors (1).

40436689 is an equidigital number, since it uses as much as digits as its factorization.

40436689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 40436689 is about 6358.9849032688. The cubic root of 40436689 is about 343.2352337528.

The spelling of 40436689 in words is "forty million, four hundred thirty-six thousand, six hundred eighty-nine".