1438643838 has 8 divisors (see below), whose sum is σ = 2877287688. Its totient is φ = 479547944.

The previous prime is 1438643807. The next prime is 1438643839. The reversal of 1438643838 is 8383468341.

It is a sphenic number, since it is the product of 3 distinct primes.

1438643838 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1438643839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119886981 + ... + 119886992.

It is an arithmetic number, because the mean of its divisors is an integer number (359660961).

Almost surely, 2^1438643838 is an apocalyptic number.

1438643838 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1438643838 is a wasteful number, since it uses less digits than its factorization.

1438643838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239773978.

The product of its digits is 1327104, while the sum is 48.

The square root of 1438643838 is about 37929.4587095571. The cubic root of 1438643838 is about 1128.8886240615. Note that the first 3 decimals are identical.

The spelling of 1438643838 in words is "one billion, four hundred thirty-eight million, six hundred forty-three thousand, eight hundred thirty-eight".