438385811 has 2 divisors, whose sum is σ = 438385812. Its totient is φ = 438385810.

The previous prime is 438385799. The next prime is 438385813. The reversal of 438385811 is 118583834.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 438385811 - 2⁶ = 438385747 is a prime.

It is a super-2 number, since 2×438385811² = 384364238572255442, which contains 22 as substring.

Together with 438385813, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (438385813) 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, 219192905 + 219192906.

It is an arithmetic number, because the mean of its divisors is an integer number (219192906).

Almost surely, 2^438385811 is an apocalyptic number.

438385811 is a deficient number, since it is larger than the sum of its proper divisors (1).

438385811 is an equidigital number, since it uses as much as digits as its factorization.

438385811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 92160, while the sum is 41.

The square root of 438385811 is about 20937.6648889030. The cubic root of 438385811 is about 759.6592487913.

The spelling of 438385811 in words is "four hundred thirty-eight million, three hundred eighty-five thousand, eight hundred eleven".