438636838 has 4 divisors (see below), whose sum is σ = 657955260. Its totient is φ = 219318418.

The previous prime is 438636833. The next prime is 438636871. The reversal of 438636838 is 838636834.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 438636791 and 438636800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438636833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109659208 + ... + 109659211.

It is an arithmetic number, because the mean of its divisors is an integer number (164488815).

Almost surely, 2^438636838 is an apocalyptic number.

438636838 is a deficient number, since it is larger than the sum of its proper divisors (219318422).

438636838 is a wasteful number, since it uses less digits than its factorization.

438636838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219318421.

The product of its digits is 1990656, while the sum is 49.

The square root of 438636838 is about 20943.6586584102. The cubic root of 438636838 is about 759.8042189604.

The spelling of 438636838 in words is "four hundred thirty-eight million, six hundred thirty-six thousand, eight hundred thirty-eight".