438739173947 has 2 divisors, whose sum is σ = 438739173948. Its totient is φ = 438739173946.

The previous prime is 438739173923. The next prime is 438739173967. The reversal of 438739173947 is 749371937834.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-438739173947 is a prime.

It is not a weakly prime, because it can be changed into another prime (438739173967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219369586973 + 219369586974.

It is an arithmetic number, because the mean of its divisors is an integer number (219369586974).

Almost surely, 2^438739173947 is an apocalyptic number.

438739173947 is a deficient number, since it is larger than the sum of its proper divisors (1).

438739173947 is an equidigital number, since it uses as much as digits as its factorization.

438739173947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96018048, while the sum is 65.

The spelling of 438739173947 in words is "four hundred thirty-eight billion, seven hundred thirty-nine million, one hundred seventy-three thousand, nine hundred forty-seven".