438199789 has 2 divisors, whose sum is σ = 438199790. Its totient is φ = 438199788.

The previous prime is 438199763. The next prime is 438199877. The reversal of 438199789 is 987991834.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 386790889 + 51408900 = 19667^2 + 7170^2 .

It is a cyclic number.

It is not a de Polignac number, because 438199789 - 2⁵ = 438199757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (438199739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219099894 + 219099895.

It is an arithmetic number, because the mean of its divisors is an integer number (219099895).

Almost surely, 2^438199789 is an apocalyptic number.

It is an amenable number.

438199789 is a deficient number, since it is larger than the sum of its proper divisors (1).

438199789 is an equidigital number, since it uses as much as digits as its factorization.

438199789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 58.

The square root of 438199789 is about 20933.2221361166. Note that the first 3 decimals coincide. The cubic root of 438199789 is about 759.5517838430.

The spelling of 438199789 in words is "four hundred thirty-eight million, one hundred ninety-nine thousand, seven hundred eighty-nine".