438043381 has 2 divisors, whose sum is σ = 438043382. Its totient is φ = 438043380.

The previous prime is 438043339. The next prime is 438043391. The reversal of 438043381 is 183340834.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 282542481 + 155500900 = 16809^2 + 12470^2 .

It is a cyclic number.

It is not a de Polignac number, because 438043381 - 2¹³ = 438035189 is a prime.

It is a super-2 number, since 2×438043381² = 383764007275822322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (438043321) 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, 219021690 + 219021691.

It is an arithmetic number, because the mean of its divisors is an integer number (219021691).

Almost surely, 2^438043381 is an apocalyptic number.

It is an amenable number.

438043381 is a deficient number, since it is larger than the sum of its proper divisors (1).

438043381 is an equidigital number, since it uses as much as digits as its factorization.

438043381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 438043381 is about 20929.4859229748. The cubic root of 438043381 is about 759.4614033699.

The spelling of 438043381 in words is "four hundred thirty-eight million, forty-three thousand, three hundred eighty-one".