438739173809 has 2 divisors, whose sum is σ = 438739173810. Its totient is φ = 438739173808.

The previous prime is 438739173751. The next prime is 438739173923. The reversal of 438739173809 is 908371937834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 291319267600 + 147419906209 = 539740^2 + 383953^2 .

It is a cyclic number.

It is not a de Polignac number, because 438739173809 - 2³² = 434444206513 is a prime.

It is not a weakly prime, because it can be changed into another prime (438739173209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219369586904 + 219369586905.

It is an arithmetic number, because the mean of its divisors is an integer number (219369586905).

Almost surely, 2^438739173809 is an apocalyptic number.

It is an amenable number.

438739173809 is a deficient number, since it is larger than the sum of its proper divisors (1).

438739173809 is an equidigital number, since it uses as much as digits as its factorization.

438739173809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27433728, while the sum is 62.

The spelling of 438739173809 in words is "four hundred thirty-eight billion, seven hundred thirty-nine million, one hundred seventy-three thousand, eight hundred nine".