18438234 has 32 divisors (see below), whose sum is σ = 39320640. Its totient is φ = 5743872.

The previous prime is 18438221. The next prime is 18438263. The reversal of 18438234 is 43283481.

It is a junction number, because it is equal to n+sod(n) for n = 18438195 and 18438204.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 16072 + ... + 17180.

It is an arithmetic number, because the mean of its divisors is an integer number (1228770).

Almost surely, 2^18438234 is an apocalyptic number.

18438234 is an abundant number, since it is smaller than the sum of its proper divisors (20882406).

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

18438234 is a wasteful number, since it uses less digits than its factorization.

18438234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294.

The product of its digits is 18432, while the sum is 33.

The square root of 18438234 is about 4293.9764787432. The cubic root of 18438234 is about 264.1839569577.

The spelling of 18438234 in words is "eighteen million, four hundred thirty-eight thousand, two hundred thirty-four".