438793891 has 2 divisors, whose sum is σ = 438793892. Its totient is φ = 438793890.

The previous prime is 438793889. The next prime is 438793903. The reversal of 438793891 is 198397834.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 438793891 - 2¹ = 438793889 is a prime.

Together with 438793889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (438793811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219396945 + 219396946.

It is an arithmetic number, because the mean of its divisors is an integer number (219396946).

Almost surely, 2^438793891 is an apocalyptic number.

438793891 is a deficient number, since it is larger than the sum of its proper divisors (1).

438793891 is an equidigital number, since it uses as much as digits as its factorization.

438793891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 52.

The square root of 438793891 is about 20947.4077393839. The cubic root of 438793891 is about 759.8948902421.

The spelling of 438793891 in words is "four hundred thirty-eight million, seven hundred ninety-three thousand, eight hundred ninety-one".