40407640409 has 2 divisors, whose sum is σ = 40407640410. Its totient is φ = 40407640408.

The previous prime is 40407640387. The next prime is 40407640439. The reversal of 40407640409 is 90404670404.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22515902809 + 17891737600 = 150053^2 + 133760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40407640409 is a prime.

It is not a weakly prime, because it can be changed into another prime (40407640439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20203820204 + 20203820205.

It is an arithmetic number, because the mean of its divisors is an integer number (20203820205).

Almost surely, 2^40407640409 is an apocalyptic number.

It is an amenable number.

40407640409 is a deficient number, since it is larger than the sum of its proper divisors (1).

40407640409 is an equidigital number, since it uses as much as digits as its factorization.

40407640409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 38.

The spelling of 40407640409 in words is "forty billion, four hundred seven million, six hundred forty thousand, four hundred nine".