438963434821 has 2 divisors, whose sum is σ = 438963434822. Its totient is φ = 438963434820.

The previous prime is 438963434783. The next prime is 438963434837. The reversal of 438963434821 is 128434369834.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 418885961796 + 20077473025 = 647214^2 + 141695^2 .

It is a cyclic number.

It is not a de Polignac number, because 438963434821 - 2²⁷ = 438829217093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (438963432821) 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, 219481717410 + 219481717411.

It is an arithmetic number, because the mean of its divisors is an integer number (219481717411).

Almost surely, 2^438963434821 is an apocalyptic number.

It is an amenable number.

438963434821 is a deficient number, since it is larger than the sum of its proper divisors (1).

438963434821 is an equidigital number, since it uses as much as digits as its factorization.

438963434821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11943936, while the sum is 55.

The spelling of 438963434821 in words is "four hundred thirty-eight billion, nine hundred sixty-three million, four hundred thirty-four thousand, eight hundred twenty-one".