438223813 has 2 divisors, whose sum is σ = 438223814. Its totient is φ = 438223812.

The previous prime is 438223801. The next prime is 438223859. The reversal of 438223813 is 318322834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 367949124 + 70274689 = 19182^2 + 8383^2 .

It is a cyclic number.

It is not a de Polignac number, because 438223813 - 2¹⁷ = 438092741 is a prime.

It is a super-2 number, since 2×438223813² = 384080220560517938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (438223213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219111906 + 219111907.

It is an arithmetic number, because the mean of its divisors is an integer number (219111907).

Almost surely, 2^438223813 is an apocalyptic number.

It is an amenable number.

438223813 is a deficient number, since it is larger than the sum of its proper divisors (1).

438223813 is an equidigital number, since it uses as much as digits as its factorization.

438223813 is an odious number, because the sum of its binary digits is odd.

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

The square root of 438223813 is about 20933.7959529561. The cubic root of 438223813 is about 759.5656642229.

The spelling of 438223813 in words is "four hundred thirty-eight million, two hundred twenty-three thousand, eight hundred thirteen".