40409693 has 2 divisors, whose sum is σ = 40409694. Its totient is φ = 40409692.

The previous prime is 40409683. The next prime is 40409711. The reversal of 40409693 is 39690404.

It is a happy number.

40409693 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., 31058329 + 9351364 = 5573^2 + 3058^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40409693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40409653) 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, 20204846 + 20204847.

It is an arithmetic number, because the mean of its divisors is an integer number (20204847).

Almost surely, 2^40409693 is an apocalyptic number.

It is an amenable number.

40409693 is a deficient number, since it is larger than the sum of its proper divisors (1).

40409693 is an equidigital number, since it uses as much as digits as its factorization.

40409693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 40409693 is about 6356.8618830363. The cubic root of 40409693 is about 343.1588341481.

The spelling of 40409693 in words is "forty million, four hundred nine thousand, six hundred ninety-three".