438739173923 has 2 divisors, whose sum is σ = 438739173924. Its totient is φ = 438739173922.

The previous prime is 438739173809. The next prime is 438739173947. The reversal of 438739173923 is 329371937834.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 438739173923 - 2²⁶ = 438672065059 is a prime.

It is not a weakly prime, because it can be changed into another prime (438739173973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219369586961 + 219369586962.

It is an arithmetic number, because the mean of its divisors is an integer number (219369586962).

Almost surely, 2^438739173923 is an apocalyptic number.

438739173923 is a deficient number, since it is larger than the sum of its proper divisors (1).

438739173923 is an equidigital number, since it uses as much as digits as its factorization.

438739173923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20575296, while the sum is 59.

The spelling of 438739173923 in words is "four hundred thirty-eight billion, seven hundred thirty-nine million, one hundred seventy-three thousand, nine hundred twenty-three".