438418909 has 2 divisors, whose sum is σ = 438418910. Its totient is φ = 438418908.

The previous prime is 438418873. The next prime is 438418919. The reversal of 438418909 is 909814834.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 322920900 + 115498009 = 17970^2 + 10747^2 .

It is a cyclic number.

It is not a de Polignac number, because 438418909 - 2¹⁹ = 437894621 is a prime.

It is a super-2 number, since 2×438418909² = 384422279537500562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (438418919) 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, 219209454 + 219209455.

It is an arithmetic number, because the mean of its divisors is an integer number (219209455).

Almost surely, 2^438418909 is an apocalyptic number.

It is an amenable number.

438418909 is a deficient number, since it is larger than the sum of its proper divisors (1).

438418909 is an equidigital number, since it uses as much as digits as its factorization.

438418909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 438418909 is about 20938.4552677603. The cubic root of 438418909 is about 759.6783663269.

The spelling of 438418909 in words is "four hundred thirty-eight million, four hundred eighteen thousand, nine hundred nine".