40684330809389 has 2 divisors, whose sum is σ = 40684330809390. Its totient is φ = 40684330809388.

The previous prime is 40684330809323. The next prime is 40684330809413. The reversal of 40684330809389 is 98390803348604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31799561592100 + 8884769217289 = 5639110^2 + 2980733^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40684330809389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40684330809319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20342165404694 + 20342165404695.

It is an arithmetic number, because the mean of its divisors is an integer number (20342165404695).

Almost surely, 2^{40684330809389} is an apocalyptic number.

It is an amenable number.

40684330809389 is a deficient number, since it is larger than the sum of its proper divisors (1).

40684330809389 is an equidigital number, since it uses as much as digits as its factorization.

40684330809389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107495424, while the sum is 65.

The spelling of 40684330809389 in words is "forty trillion, six hundred eighty-four billion, three hundred thirty million, eight hundred nine thousand, three hundred eighty-nine".