438143213 has 2 divisors, whose sum is σ = 438143214. Its totient is φ = 438143212.

The previous prime is 438143203. The next prime is 438143221. The reversal of 438143213 is 312341834.

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., 435056164 + 3087049 = 20858^2 + 1757^2 .

It is a cyclic number.

It is not a de Polignac number, because 438143213 - 2²⁸ = 169707757 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (438143203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219071606 + 219071607.

It is an arithmetic number, because the mean of its divisors is an integer number (219071607).

Almost surely, 2^438143213 is an apocalyptic number.

It is an amenable number.

438143213 is a deficient number, since it is larger than the sum of its proper divisors (1).

438143213 is an equidigital number, since it uses as much as digits as its factorization.

438143213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 29.

The square root of 438143213 is about 20931.8707477378. The cubic root of 438143213 is about 759.5190938446.

The spelling of 438143213 in words is "four hundred thirty-eight million, one hundred forty-three thousand, two hundred thirteen".