438643523 has 2 divisors, whose sum is σ = 438643524. Its totient is φ = 438643522.

The previous prime is 438643501. The next prime is 438643591. The reversal of 438643523 is 325346834.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 438643523 - 2⁸ = 438643267 is a prime.

It is not a weakly prime, because it can be changed into another prime (438643123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219321761 + 219321762.

It is an arithmetic number, because the mean of its divisors is an integer number (219321762).

Almost surely, 2^438643523 is an apocalyptic number.

438643523 is a deficient number, since it is larger than the sum of its proper divisors (1).

438643523 is an equidigital number, since it uses as much as digits as its factorization.

438643523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 38.

The square root of 438643523 is about 20943.8182526492. The cubic root of 438643523 is about 759.8080788470.

The spelling of 438643523 in words is "four hundred thirty-eight million, six hundred forty-three thousand, five hundred twenty-three".