18854438 has 4 divisors (see below), whose sum is σ = 28281660. Its totient is φ = 9427218.

The previous prime is 18854419. The next prime is 18854443. The reversal of 18854438 is 83445881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83445881 = 227 ⋅367603.

It is a junction number, because it is equal to n+sod(n) for n = 18854395 and 18854404.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4713608 + ... + 4713611.

It is an arithmetic number, because the mean of its divisors is an integer number (7070415).

Almost surely, 2^18854438 is an apocalyptic number.

18854438 is a deficient number, since it is larger than the sum of its proper divisors (9427222).

18854438 is an equidigital number, since it uses as much as digits as its factorization.

18854438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9427221.

The product of its digits is 122880, while the sum is 41.

The square root of 18854438 is about 4342.1697341306. The cubic root of 18854438 is about 266.1569823556.

The spelling of 18854438 in words is "eighteen million, eight hundred fifty-four thousand, four hundred thirty-eight".