18438834 has 16 divisors (see below), whose sum is σ = 37071072. Its totient is φ = 6114048.

The previous prime is 18438821. The next prime is 18438841. The reversal of 18438834 is 43883481.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18438792 and 18438801.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6804 + ... + 9119.

It is an arithmetic number, because the mean of its divisors is an integer number (2316942).

Almost surely, 2^18438834 is an apocalyptic number.

18438834 is an abundant number, since it is smaller than the sum of its proper divisors (18632238).

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

18438834 is a wasteful number, since it uses less digits than its factorization.

18438834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16121.

The product of its digits is 73728, while the sum is 39.

The square root of 18438834 is about 4294.0463434854. The cubic root of 18438834 is about 264.1868225368.

The spelling of 18438834 in words is "eighteen million, four hundred thirty-eight thousand, eight hundred thirty-four".