18838438 has 8 divisors (see below), whose sum is σ = 28276200. Its totient is φ = 9413040.

The previous prime is 18838411. The next prime is 18838451. The reversal of 18838438 is 83483881.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 18838394 and 18838403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3738 + ... + 7186.

It is an arithmetic number, because the mean of its divisors is an integer number (3534525).

Almost surely, 2^18838438 is an apocalyptic number.

18838438 is a deficient number, since it is larger than the sum of its proper divisors (9437762).

18838438 is a wasteful number, since it uses less digits than its factorization.

18838438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6182.

The product of its digits is 147456, while the sum is 43.

The square root of 18838438 is about 4340.3269462104. The cubic root of 18838438 is about 266.0816735275.

The spelling of 18838438 in words is "eighteen million, eight hundred thirty-eight thousand, four hundred thirty-eight".