438418919 has 2 divisors, whose sum is σ = 438418920. Its totient is φ = 438418918.

The previous prime is 438418909. The next prime is 438418931. The reversal of 438418919 is 919814834.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-438418919 is a prime.

It is a super-2 number, since 2×438418919² = 384422297074257122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (438418909) 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, 219209459 + 219209460.

It is an arithmetic number, because the mean of its divisors is an integer number (219209460).

Almost surely, 2^438418919 is an apocalyptic number.

438418919 is a deficient number, since it is larger than the sum of its proper divisors (1).

438418919 is an equidigital number, since it uses as much as digits as its factorization.

438418919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 47.

The square root of 438418919 is about 20938.4555065554. The cubic root of 438418919 is about 759.6783721028.

The spelling of 438418919 in words is "four hundred thirty-eight million, four hundred eighteen thousand, nine hundred nineteen".