40689757 has 2 divisors, whose sum is σ = 40689758. Its totient is φ = 40689756.

The previous prime is 40689713. The next prime is 40689767. The reversal of 40689757 is 75798604.

It is a happy number.

40689757 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., 37380996 + 3308761 = 6114^2 + 1819^2 .

It is a cyclic number.

It is not a de Polignac number, because 40689757 - 2⁷ = 40689629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40689707) 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, 20344878 + 20344879.

It is an arithmetic number, because the mean of its divisors is an integer number (20344879).

Almost surely, 2^40689757 is an apocalyptic number.

It is an amenable number.

40689757 is a deficient number, since it is larger than the sum of its proper divisors (1).

40689757 is an equidigital number, since it uses as much as digits as its factorization.

40689757 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 40689757 is about 6378.8523262418. The cubic root of 40689757 is about 343.9497768981.

The spelling of 40689757 in words is "forty million, six hundred eighty-nine thousand, seven hundred fifty-seven".