438686686889 has 12 divisors (see below), whose sum is σ = 482787478320. Its totient is φ = 398314243800.

The previous prime is 438686686877. The next prime is 438686686903. The reversal of 438686686889 is 988686686834.

It is not a de Polignac number, because 438686686889 - 2¹² = 438686682793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (438686686189) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2137079 + ... + 2333340.

It is an arithmetic number, because the mean of its divisors is an integer number (40232289860).

Almost surely, 2^438686686889 is an apocalyptic number.

It is an amenable number.

438686686889 is a deficient number, since it is larger than the sum of its proper divisors (44100791431).

438686686889 is a wasteful number, since it uses less digits than its factorization.

438686686889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4471252 (or 4471241 counting only the distinct ones).

The product of its digits is 4586471424, while the sum is 80.

Subtracting 438686686889 from its reverse (988686686834), we obtain a palindrome (549999999945).

The spelling of 438686686889 in words is "four hundred thirty-eight billion, six hundred eighty-six million, six hundred eighty-six thousand, eight hundred eighty-nine".